Help! Hives Breakouts

Recently, end of summer, I began getting hives on different parts of my body. I saw a Dermatologist who gave me an ointment but i was told not to use it often because it will thin out the skin. I have looked at medications that i take, Zoloft, Zocore, sometimes Tylenol PM to sleep and have started taking Zrytec to control the hives, which it does to some extent. I use Basis soap on my face , which thankfully does not break out ,but i do use it on the rest of my body. Also just washed some personal laundry in Woolite. I have just broke on my hands and lower arms. So while that might be part of the problem , that is not a everyday occurrence. I am totally baffled and not getting much help from the medical profession. Should i be tested for what, i don't know. Help!!