I have suffered severely from cholinergic urticaria now for 3 years. I believe I have found my cure. (I am not saying this will work for everyone!)
I started donating plasma and my CU cleared right up. I have never felt happier. I can get hot and be active again without itching. My doctor who was previously stumped by my CU thinks that there was some irritant in my blood/plasma and so when I donate, it sorta of cleans it out, lol.
I tested this theory and when I stopped donating, the cholinergic urticaria did come back. However, not so severely.
I just wanted to share this. 🙂