I did my back in a while ago, a few years after I had surgery on it, and I was put on prednisone for a short time. The first 24 hrs I was love'n it! Wow! I felt like I had hyper spidey senses and was on top of the world. After 24hrs I hated it. I was wound up, slept crappy and was thrilled to get off of it. BTW, it did work well on the back pain.
My wife has battled Multiple Sclerosis for over 20 yrs. Typical protocol is large doses of prednisone during episodes. It works very well at controlling the episodes but it is not a pleasant drug to live with. Typical symptoms for her, hyper, inability to focus, tired, but can't sleep. Sleep comes in two hour blocks for my wife, if she is lucky. She is about to finish up on the latest round and is tapering off, she can't wait till it is over.
Bottom line, the drug works, but not without side effects.
Best of luck. Listen to your doc and ask lots of questions.