I had a cortisone shot in both knees due to two falls with subsequent pain...the Dr. determined I had arthritis and this was aggravated due to the falls. About a week after receiving them...I had some spells of racing heart which has now increased to almost daily after 4 weeks. I also have extreme insomnia. I previously had very severe reactions to prednisone years ago ..given for sinus issues. I was told not to take oral steroids in the future. That was on my allergy chart to the Dr. He said shots in the joints are different. Please comment on the systemic affects of these knee joint shots and if this response could be from the shots...and how long will this last or what can I do to eliminate them.