Horrible hives putting a halt on my life.

[Avox]

I am a 18 year old man that first had a breakout when I was playing basketball with my friends in February of this year. My inner arms by my elbow,we're just red, it kind of itched a little, and I kind of brushed it off. It has only gotten worse, I have gone under many tests that all come back negative, thyroid, lupis, autoimmune, etc... I am currently taking 1 Zantac 150 mg in the morning and night, 1 allegra in the morning, 2 zyrtec at night, and benedryl every 4 hours. I can not go outside in the day time, I can not workout, I can not eat hot/spicy foods, I can not get heated up or over heated, and I can't even have sex without getting hives. The pain is the worst when I have sex. Regardless, the pain is always horrible. The hives are everywhere on my body, except after sex, after sex it is just my legs, mainly under my knees but still the worst. Does anybody recommend anything? Should I ask my doctor about Xolair? I get a reaction Atleast 10 times a day.