What Causes Severe Joint Pains With History Of Having Cortisone Injections?

I was given repeated cortisone injections in my butt for a major skin allergy 15 years ago. the injections were given 1x aweek for 2 months. I was later informed by another Dr. this was wrong. Now I m experiencing severe bone and joint pain and we don t know why. I also just learned I have diabetes and HBP. Could those injections have anything to do with that cushings syndrome?