My doctor prescribe prednisone for my hives for a week. It didnt go away, its been 5months & I'm still taking anti histamine so it wont appear everyday?

Common. That's common with chronic urticaria, prednisone was to control a flare up, andnot to eradicate it altogether, you still have to be on daily antihistamines to control the chronic condition, better see an allergist / dermatologist if you haven't done so already, check or for an allergist in your area, good luck.