Is there anything you can do to treat eczema and skin allergies besides medications?

Almost 2 years ago now I broke out in an itchy bumpy rash. It started around the backs of my knees, slowly made its way up my thighs, around the front of my knees, to my lower back, my shoulder blades, the inside of my upper arms, the back of my lower arms under my elbow, and then to my knuckles and sometimes inbetween my fingers. I immediately went to the doctor because it progressed quickly and he suggested that it was a pesticide, or bed bugs, basically that lived under your skin and caused an itchy red rash. I was given pesticide which made my affected areas burn severly. Stopped that, and went to a local dermatologist who suggested the same thing. Leaving that possibility behind again, I went to another dermatologist. She said I had a bad allergic reaction to nickle(from my belt holes and buckle), along with eczema, and a mild case of hay fever. She gave me a cream that always makes the itching stop temporarily, but has never gotten rid of the rash totally. Suggestions?