I had really bad Cholinergic Urticaria for about one and a half years. The doctors prescribed some anti histamines that were quite useless. The urticaria was associated with a decline in my physical and mental health. After a while, I came to terms with it and felt a lot better about myself.
My physical health still wasn’t great and I knew something was wrong, I decided to focus on my diet and try out different things. After a few semi-disastrous/hilarious/absurd ideas, I realised that I had a problem with gluten. I went on a completely gluten-free diet and my health improved over the course of a few months. By the third month, I noticed break outs of urticaria less and less until eventually it was almost completely gone. Today, about two years later, I have a gluten-free diet and I’m doing fine, have no problems with urticaria. (I feel pricks every so often but nothing that hinders me.)
I’m not suggesting this is a solution to everyone’s problem but the only difference between myself know and back then is diet, it doesn’t take an expert in deduction to realise that there could be a link. I highly recommend going on a gluten-free diet if possible, even if it doesn’t help the urticaria, it will still improve your health.