(I'm really sorry for the wall of text but I wanted to provide a full context and did my best at shortening it all)

So first to provide some context, my grandpa (69yo) got diagnosed with his brain tumor in March this year, anaplastic oligodendroglioma III (though in the later months docs changed their minds to most likely G IV). Had his surgery late March, then RT from mid-May till the end of June and has undergone five rounds of Temozolomide chemo, last one early December. The MRI scans, after talking with numerous docs, showed that the tumor regretfully was still there all along as total resection was impossible in March already but RT + chemo did a good job of significantly slowing down its spread. Even 10 days ago grandpa felt good, had good sense of humour, the communication with him was perfectly fine. Had left side paresis but we excercised every day and had rehabilitation team come in twice or thrice a week. He had good appetite, drank over 2.5l of fluids every day, every blood works before the chemos went great.

Suddenly two days after the fifth round of chemo, grandpa vomited pretty heavily and suddenly the communication with him became way worse. He already had such an episode (rapid weakness, problems with communication, sleeping all day long) after the second round of chemo and the doctors told us then that it was nothing to worry about and it should return to normal within a day or two of no vomiting - and it did. So this time we tried to wait it out too. We gave him anti-vomit pills that they prescribed, tried to put as much fluids and food into him, just like after the 2nd chemo. This time however things weren't getting better and the communication was even getting worse after two days and there were serious problems with swallowing, to the point of not being able to swallow basically anything - so we called the ambulance. They told us that most like it was dehydration because of the vomiting two days prior cause it's really easy to get dehydrated in cancer patients, gave him an IV to hydrate him along with a Dexamethasone shot inside and told us to wait a few hours and contact them if it doesn't get better. It did not so we called them and they took gramps to the hospital.

There, after some tests, grandpa was moved into the neurology ward cause they found out on CT that it was actually a hemmorhage into the cancerous part of the brain. They told us that his state was serious but stable and that we need to wait and see how (and if) the tumor within which the bleeding occured manages to absorb the blood. I called every day and while every time I talked with a different doctor (that's how things work around here...) the basic premise was the same - the condition is serious though stable and we need to wait it out and see, most likely till next week. The communication with grandpa wasn't getting any better but they told us that despite the hemorrhage, the main problem is his tumor and while it will surely cause grandpa's death, it won't be sudden and it's hard to predict when it will happen. Yesterday they even started talking with me about the scenarios of discharging him if the CT next week looks promising.

And today they called me that grandpa was dead. I'm shaken because like I said, everyone told me again and again that the condition is stable and while it's still risky, nothing sudden should happen. Of course I talked to the doctor afterwards and he told me that it didn't look like the hemorrhage bled any more and to them, the reason of death was the swelling and pressure inside the skull caused by the bleeding along with the primary tumor.

And now I'm trying to make sense of it. I just don't understand the tumor explanation honestly cause on Friday morning grandpa's tumor was the same size as Friday evening and yet those were two completely different men - with way worse communication, with sudden onset weakness and swallowing problems, with constant sleeping. Obviously all the new symptoms were created by the hemorrhage and not the tumor itself cause I don't really see how the tumor could have gotten so much bigger that _that_ was actually the cause of death and not not the bleeding? Doctors seemed at times to scapegoat the tumor to the point of attributing every symptom grandpa had to it and yet grandpa had it 3, 5 or 10 days before that as well and his state was incomparably better. Shouldn't problems related to the tumor happen gradually, with the patient's condition worsening with time, rather than suddenly within an hour?

And secondly, how come the "stable" condition changed so fast - last evening it was stable, this morning he was gone. Is it just a thing with intracranial bleedings to the tumor that they can change from seemingly stable to lethal in a matter of hours? If swelling is the problem, can't you just up the steroid for some time or do some kind of procedure/surgery to do something about it?

I'm not trying to sound accusatory, I'm just throwing these questions in the air cause I'd like to fully understand how it all happened (and so suddenly at that) and how grandpa, despite having the tumor we were fully aware of, first changed from his joyful and happy self to the barely communicational, unable to swallow, unable to sit upright within hours basically - and then went on to change from stabilizing _that_ to being dead within a week. I'm not accusing the doctors of being incompetent or anything but they surely failed at providing me, a layman, with answers to my questions cause every answer was just "You know, the tumor is the main problem" as if the tumor was something new or as if it progressed significantly from Friday morning (two days after chemo) to Friday night (after the vomiting episode after which grandpa started feeling so bad). Thank you in advance for helping me understand it all and if it really is just the way these tumors work that the patient's state can change 180 degrees within a couple of hours, changing them from functioning so well to gone within days.