I’ve had what seems to be drug-induced CIU for a long time. It seems to be caused by epilepsy meds that I’m on. I’ve been trying different medications to see if I can find something that won’t cause it without luck. The current situation is a lot of Zyrtec with very little success after five months. I have noticed that on days that I run for at least 30 minutes that the hives are down or if I spend a long time in a hot sauna the hives also are reduced. Does this seem normal?