Is there anyone who has had experience of this form of cancer, as things have deteriorated SO much within1 week, that as a famiy we havent got any idea, of the timescale we are facing.

Brief summary my 34 year old brother has primary brain tumours, which have grown on the last course of chemo and within 3 months of last scan.  1 is on brain stem so inoperable,now has about 4.  He had a drain fitted to 1, 2 weeks again and they removed 40ml of fluid.  At this point he could walk (slowly) and talk, balance affected, constant noise in the ears, sight slightly affected.

Started new chemo last week, now can hardly hear, side of his face dropped (looks like hes had a stroke but may be tumours affecting), struggling having a conversation, sleeping mostly, although he thinks hes hardly slept and noise in his head has got louder, so we have to shout when talking?  Anyone experienced it, no-one saying anything.  Now hes talking about marrying his partner, does he have time?  Thanks any info appreciated xx