Hi, and thanks for your medical question on eHealth forum!
If you have abdominal discomfort after eating meat then this can be due to meat allergy. An allergy test can be done to confirm this. If you are allergic to all animal protein then I am sorry but you will have to fore go any kind of meat.
Sometimes meat allergy is specific to either chicken meat or red meat or to fish, in which case you can take the other meat types. Hope this helps. Take care!