Do I Really Have Seabather's Eruption After Taking Steroids, Zrtec 2x a Day, 5 Months Later? (photo)

Felt a stinging sensation while snorkeling in the Philippians. By the time I got to shore I had a rash on my legs and arms. Two days later is was all over my body. Incredibly itchy and worse at night. The rash comes and goes. Nothing soothes it but shuttle spray. It gets worse with heat and in the sun. Its been five months.