Enzymes didn't help me so sometimes they don't even work.
Chrissy, you are not being selfish for telling them what you cannot have. I think they should understand. I had made a list for my family to put at the fridge when I was on SCD so they remember what I can and cannot have. It helped a lot.
I tell everyone that I cannot have milk because I'm intolerant and so far everyone understands. I either just have coffee without milk, bring my own or they have alternatives
Lactose intolerance & UC is not a good combination so I understand why you are bleeding when you have it. It's probably best to completely stay away from it.