I've been suffering with several severe symptoms since the end of October and they're only getting worse.

i've lost two stone since it started, it began one night where I had severe abdominal pain, diarrhoea, and threw up. Since then I've suffered with constant abdominal pain and won't have a bowel motion for about two or three weeks at a time. I know the pain is not caused by constipation because even when I do manage to go none of the symptoms ease up in the slightest. I've started getting blood in my stools and clots of blood in mucus when I have a bowel motion with very thin stools. i'm in so much pain and nobody is taking me seriously because I'm only 21. I have a long family history of bowel cancer and issues at young ages. my doctor refuses to refer me for any treatment or tests because of my age but she did do a blood test which came back that I was severely anaemic. I've decided to go private for a couple of tests now as no one is listening to me, I've had an ultrasound which came back clear because it can't actually see my bowels or inside my stomach and I have an MRI coming up. i'm going to book a colonoscopy too. I haven't been able to eat anything or drink barely at all but my stomach is huge. I feel nauseous 24 seven and I'm so weak I can't really do anything, even when I force myself to eat I don't feel any less weak or dizzy.  I attended A&E a few days ago and they put me on a drip, and again I was told that they won't do anything because I'm so young and it's so unlikely to be anything bad so I was sent home with painkillers.

Blood tests cleared me of any infection or inflammation. Kidney function normal, thyroid normal, liver came back abnormal but no concern, very low on iron and ferritin. I cant function at all i'm so weak exhausted and in extreme pain. they found blood in my stools when i begged for a stool test and urine test, found ketones in my urine and blood, but refuse to test me anymore. I don't know what to do I'm really at a loss I know something is severely wrong it's getting worse by the day but no one is taking me seriously what do I do.