PredniSONE and preservatives

I moved to Florida in Sept. and my face broke out and swelled tremendously. We went to the emergency room and they put me on prednisone for 2 weeks. Everytime I went off prednisone my face swelled back up. Three times I went to the emergency room within 8 months. They filled me with pills or shots and it was all prednisone. The eight month my allergy doctor said he had never seen anything like this. He had me to go to USF to see a dermatologist. He did testing and found out I was allergic to preservatives in makeup and other cleaning products. He put me on protopic which last month I found out its side effects and I have just stopped all medicines. My face right now is broke out in places but I refuse to put any medicine back on my face. How long does it take to get all these medicines out of your system? Does anyone know. I believe these medicines have caused me more problems after I took them than before.