Allergy question?

I got an allergic reaction from something and now i have a rash on my ears, back, neck, arms, stomach, legs, and upper thighs (kind of by vag). I''m literally itchy EVERYWHERE, even my face and its terrible!

I've had this since last night and whenever a rash goes away on my body it comes back somewhere else. I went to doctor and he said take clariton but im not sure if that will work. Have any of you ever had any similiar experiences? How could i get rid of this rash and its itchyness? Any recommendations?
Allergy question?
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