Can ulcers on the bowel be caused by being "unwell"

basically I was in hospital for 6 weeks including intensive care almost 2 years ago now after just turning 17. long story short, they thought I had an infection, then after a couple weeks went by, my liver and kidneys started failing and blood platelets dropped, but the antibiotics didn't work, so they put the whole thing down to rare monno complications. one of the tests they did colonoscopy, where they found multiple ulcers so they took biopsies and everything came back fine. they put the ulcers down to being "unwell". before the hospital stay, I always had diarrhea and was going toilet quite frequently. but since then I feel like it's been worse and I've been going toilet at least 2 times on a good day. so because of the symptoms and the fact they found ulcers when I was in hospital, they want to do another colonoscopy to make sure they're still not there.

I know doctors know better than you guys but still have a few questions.

can being "unwell" really cause ulcers in the bowel?

the doctor I last seen said the symptoms do match up with chrons disease because I get stomach cramps, diarrhea, toilet multiple times a day and recently diagnosed with b12 deficiency. I told him when I was in hospital that I was tested for chrons and asked if they could have some how missed it? and he just shrugged his shoulders.

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