I Am Loosing My Hair At A Rapid Pace. It

I am loosing my hair at a rapid pace. It began about 5 years ago and I am quite thin on top and at the crown. I take medication and insulin for diabetes, and small amounts of HBP and cholesterol medications. I do dye my hair but I try not to use hair dryers or heavy products. I am using Rogain presently but do not see any improvement after 5 - 6 weeks. Any suggestions?