I Have Had Hives For Over A Week And A

I have had hives for over a week and a half. They seem to be getting worse. I aslo currently have diarrhea that started around the same time. I have a history of Crohn's disease and read that this maybe be a cause. With a flare up Ive never had hives. Also the hives turn into petechia. I do have a history of ITP that petechia was associated with.