I started taking multiple perscriptions a couple of years ago for my heart and a stroke that I had, my hands break out in little water blisters and they itch really bad. I went to the dermatologist and they said I had contact dermatitis I wore gloves and kept the cream they perscribed but they are not getting better just worse. Could I be allergic to my medication?

That is always a possibility. Below are links to two pharmacy sites that contain the FDA sheets on all drugs. There will be a section on side effects as well as another section on cross-reacting drugs.

RxList (http://www.rxlist.com/script/main/hp.asp)
Drugs.com - Interactions checker (http://www.drugs.com/)