Hives

So, I have been treating an outbreak of warts on my hands with this squaric acid stuff(as nasty as it sounds, you shouldn't laugh because it isn't funny) and a couple days ago I had a pretty big patch of hives on my arm. However, today my chin was itching and I asked Tara, my sister-in-law, what was on my neck. She said it was a rash and I said, "Oh no". Of course after that It started spreading to the other side of my neck and small patches moved on to my legs.  Don't really know if I want to take benedryl or not. Unfortunately it is not the no-drowsy kind. So, If I wait to use it and end up needing it tommorrow, I may fall asleep. But, I don't know if it is serious enough to use it tonight. What should I do?