PredniSONE and sone

My 17 yr old son was prescribed Prednisone along with Accutane for Acne. His two older brothers had undergone accutane treatment when they were each 17 ish, with no major side effects - no mental disorders at all. They did not have Prednisone along with the accutane. I questioned why my youngest son should go on the prednisone but was assured by my trusted dr. of 35 years that his very low dose of 20mg a day would be no problem. We continued the dosage for 3 months and then tapered off for 3 weeks. That's when my son's trouble began. He felt a change immediately - things didn't seem 'real', he has a hard time describing the feelings. At two weeks after discontinuing the prednisone his symptoms really began to be very frightening. He is athletic and was vomiting for extended periods - probably due to the stress of what was going on in his head. We then saw 2 GPs, his Dermatologist and I contacted a Psychiatrist, His father and I didn't want him to progress to antidepressants and he does seem to be improving - nothing like some of the other stories contained here. I just wish we had NEVER gone on this - even at 20mg - for something like acne. NOT life threatening - I should have listened to my gut and just stuck with the Accutane.

A few years back I severely injured my back. As part of my treatment my doctor gave me prednisone. My joints, especially my knees hurt beyond belief. I even had go to my parents house because I couldn't move, it hurt too much. I called my doctor and you know what he told me?!?! it was all in my head.He accused me of trying to get pain pills from him. The joint pain got so bad that I had to be hospitalized. You know what they told me at the hospital. I was having a allergic reaction to prednisone. No S***t!??! anyway, since that time I have not taken prednisone. My concern now is that my doctor wants me to get a cortisone injection. . . I am scared I would get the same reaction. from the research I have done so far, it looks like it is from the same family. Does anybody know?

Thanks
B.