My body has been itching all over from head, to stomach to legs and more for the past 4 days - non stop. what can i do to relieve the itch?

Antihistamines: As an allergist I'm seeing A LOT of these types of symptoms with my patients. Antihistamines, or allergy medications, can help. I recommend OTC options like Allegra 180mg and Zantac (ranitidine) 150mg, taken together, even twice daily. This may seem like a lot, but I find that such significant itching needs higher doses. I'd try this and talk to your primary care MD re: an allergist referral. Take care.