Abdominal pain, back pain and fluctuating blood tests.

I have been back and forth from doctors since January. I came back from a lads break with severe abdominal pain to my upper right side and upper left side radiating to my back. I was also vomiting and i found a lump on my testicles. I went to the doctors straight away and was then advised to go for blood tests. I also had an ultrasound on my testicles and it turned out to be an epididymis cyst. My blood test results came back with my alt levels at 147 and my ast at 60, which the doctors wanted to keep an eye on. I was referred for an colonoscopy as i had blood in my stool and that came back clear with some haemorrhoids and no further action was needed. During this time, i also had a few more blood tests conducted and my alt levels were slowly decreasing. I had an ultrasound on my abdominal, which came back clear so back to the gp I went. My last two blood tests, ALT gone down to 40 but all of a sudden my gfr levels went to 46 and my creatinine levels went to 160. I was referred to hospital straight away the next day for more bloods. i wanted to continue on with the first bit. My ultrasound and CT scan came back and they said there was a build-up of fluid in my right kidney and they have referred me to an urologist. My blood tests all of a sudden shown an increase in bilirubin levels at 26, normal range is below 20, my alt steady at 40, normal range is below 35, and my gfr has gone back to over 90 and my creatinine gone back to 87. I am so worried about what it could be. They have eliminated CKD, but now i am worried about pancreatic cancer, kidney cancer, lymphoma etc. i fear the worst. I have also had change in stools, consistency, frequency, slight itchiness but I don’t know if that’s my mind telling me. I am 25, fairly active (used to power lift)