After 17 months on hydrochlorothiazide for blood pressure, I expe...

After 17 months on hydrochlorothiazide for blood pressure, I experienced a bright red itchy rash on sun-exposed areas ( primarily face and neck). It was diagnosed as solar urticaria (allergy to sunlight) and was successfully treated. However, after 24 months now on it, I have bright redness on my face and neck again (unpleasant but not particularly itchy) with really mild nausea. The doctor tells me it could be a side effect of the drug. I am now on another blood pressure pill, but it has been four days since I took the hydro. and the redness has not gone away.