The reason i have delayed pressure urticaria

Hello everyone, i am new here. I have delayed pressure urticaria for already 5 years. Ive been to few doctors and even a professor but it seems like they dont want to do tbeir job. I believe there is a reason these allergies started. I want to find a reason of my allergies. Did anyone find out the reason of urticaria?

Hello everyone, again. I think i might have found the reason of my allergies. I have delayed pressure urticaria. So, i stopped eating sugar at all, like pastries, chocolate, anything at all. After some time allergies stopped. Maybe it will help someone.