Sorry to hear that. Glad you’re looking for help, though the reason sucks.
As for a solution (because luckily there is one, as you’re basically suffering from chronic food poisoning), I would suggest you have a look at this: https://www.drmcdougall.com/health/education/health-science/common-health-problems/colitis-severe/
Inflammatory bowel diseases occur almost exclusively in parts of the world where the diet is high in meat and dairy foods, and are rare in countries where people still consume starch based, almost entirely vegetarian meals. Severe “allergic-type” reactions to some of those rich foods have been suspected as being the causes of these conditions.
Some clustering of cases in a family occurs, which is consistent with the fact that we learn our food preferences from our parents.
Current Treatment: Bowel contents must be changed continually in order to get long lasting significant improvement. The simple increase of the fiber content in the foods eaten has been shown to reduce the frequency of attacks and to improve symptoms in many patients. A starch-based diet, which is inherently high in fiber, is highly effective at alleviating the distress from this condition.
One step further in effective therapy is to avoid the foods that most often cause allergies–dairy products, eggs, chocolate, wheat, and citrus fruits, as well as fats of all kinds. If this approach is not successful, the final step toward diagnosis is to use an elimination diet.
Depending on how long you’ve had Crohn’s already, you may want to go ‘one step further’ immediately, though the symptoms should decrease either way. Easiest dinners are probably potatoes or sweet potatoes/yams (cooked or cut in wedges, without oil, in an oven (at 200C, 30m or until brownish) or airfryer) with steamed cruciferous vegetables (broccoli, cauliflower, sprouts) and something that’s fat-free like ketchup by way of seasoning. See here for other suggestions: https://www.drmcdougall.com/health/education/recipes/mcdougall-recipes/?cat-id=18&cat-name=Fast+%26+Easy+Meals+
For lunches, here’s a bunch of suggestions that’ll work, though feel free to come up with solutions that work for you that fit the pattern: https://www.drmcdougall.com/health/education/recipes/mcdougall-recipes/?cat-id=16&cat-name=Sandwiches
(As an aside, I also eat according to the guidelines this GP/internist recommends, though for different reasons, partly health-related, and have been for 4 years now, without it taking much effort to stick with it.)
Aside from that, Facebook has a bunch of groups organized by and for people following this diet for this and other reasons; try McDougall Friends especially, as it’s very active, with lots of ‘veterans’ who’ve been eating this way for years without problems. (This way of eating is very easy to sustain long-term, so long as you accept that during the first month or so you’ll have to invest some time and energy in acquiring new habits.)