Spinal injections symptoms and conditions

I was involved in a MVA about 4 years ago. I was prescribed oral prednisone for my back and neck pain. I took the recommended pack but about 3 days into the regimen I began having EXTREME pain in my joints- especially knees, hips, and ankles. I was not even able to walk by myself. My doctor never even suggested that it could be a side effect of the prednisone and told me that I had to finish the rx or it would be possible for me to have major reactions such as heart failure, etc. I was so scared that I finished the rx. My side effects included weight gain, mood swings, increased appetite, etc. but the worst was the joint pain. I survived the treatment and swore that I would never take the drug again. Well, never say never. My back pain continued and I went to a pain management doctor who recommended spinal injections. He said that the prednisone injections should not have the same side effects as the oral med so I received the injections. He said that he used a reduced amount of the prednisone during the procedure. I had great results with a reduction in my back pain for several months. I just this week had another injection and now I am in experiencing the same horrible pain in my joints as I had the first time with my oral rx. Is this normal? I have contacted my dr for pain med but I know that I am just covering up the side effects. Any one else have similar situation? What do you do when the treatment is worse than the ailment?