Hi
I never had allergies untill the age of 18. Now I'm always getting rashes on my skin everytime I get hot or nervous. I will also start to swell on my face. My lips and inside of my mouth will swell. My eyebrows will swell to the point I can't see. I'll get large lumps all over my head, and hives all over my body. After about twelve hours my swelling will go away, but then I'l get a red itchy rash usally on my lower back, stomach and inner thighs for a day or so. I never feel ill or have problems breathing though, usually just get tired. I though it may be food allergies, but sometimes I haven't even eaten yet. Some times for no reason I'll get red marks on my forehead. Any idea whats going on.

Optional Information:
Male , Age: 23

Already Tried:
I tried eating different things, using different soaps, shampoos, everything I can think of.