I also have stomach issues and avoid whey or dairy products in general. I usually stick to Pea Protein as it digests really well in my stomach and is hypoallergenic. Just make sure the pea protein you buy is a pea protein isolate. Generally the best pea protein flavors in my opinion are Vanilla and Chocolate.

Regarding your UC. A friend of mine has severe UC and still incorporates Whey but he was using a very pure whey isolate (Make sure it is cold microfiltrated) as they remove 98-99% of the lactose which is what can cause the UC to get worse from gas build up in your stomach.

Also, look into some very good spectrum digestive enzymes for your UC to help process the food or protein you consume.

You can PM me and I would be happy to give more suggestions as I have friends who deal with the same situation as you.

I hope all is well

Use goat whey , yes goat whey, very good for stomach and very good absorption!

I know some guys who like the pea protein.
If you can handle egg whites I’d just drink those.
I’ve seen all the study’s and used tubs of whey.
My conclusion is my body responds best to egg whites.