Hi David! sorry to know about your condition.It seems like you came in contact to something you are allergic to, thus responded with urticarial rashes. I think you should try to figure out the culprit which can be in form of food, medicine, clothing or animals. Avoiding those things could help you in slowly reverting to normal. If the case is serious like if you started having breathing difficult etc than you should immediately consult a doctor, otherwise avoiding the culprits and taking oral antihistamines regularly for few days may help you completely revert to normal state.