Hi!
I have had UC for over 35 years. I have taken many, many medications and tried every diet ever suggested. It is true that different foods have different effects for everyone. My suggestion is to take it slow in changing your diet, except make sure you are getting adequate nutrition. UC takes a lot out of you. Some find keeping a food diary helpful.
When I am flared, I have to absolutely avoid certain things, like spinach and kale. I need well cooked veggies. I try hard to get protein for healing. Eggs are good. Chicken is good. Soup broths can help a bit.
Do not blame yourself. It is not your bad diet, your lifestyle or whatever else well meaning people will mention. I cannot count how many times I have been asked if it is my diet. Seriously? I would live on sawdust if it worked.
Get yourself health professionals you trust and feel comfortable with. I have struggled with this. Many really have no clue. I now have a GI specialist who really does get it. I trust him. He listens to me. He has IBD nurses who I can talk to. He has me on Entyvio infusions every 4 weeks and I am better than I have been in years.
Drugs like Entyvio are relatively new. For decades I basically had to take prednisone to get flares under control and function. Prednisone works but it is harmful long term and has many side effects. If you can, try to fine a doctor who is up to date and understands this. Yes, it is sometimes necessary, but I am so much better without it.
About stress. UC causes stress for sure. But over all these years I have never seen a pattern of my flare ups corresponding with stress. They just make no sense. That is part of the stress of the disease. You never know when it is going to come back.
You will be OK. The new treatments are amazing. You now know what you are dealing with.
Take care.