Anxiety Support Group
Anxiety is a physical condition marked by intense and persistent feelings of distress, fear, angst or dread. General anxiety caused by routine day-to-day stresses usually passes quickly and is experienced by almost everyone at one time or another. However, such feelings that linger over time and are very difficult to cope with, and which lack a clear cause, may indicate...

You've taken the important first step in writing it out.
When it comes to sleep, rather than focusing on the word sleep itself, try setting a calming night time routine to help you relax naturally.
Give your brain simple tasks to slow it down and calm the thoughts naturally.
Best wishes as you find your better balance.
If it were me and thought prednisone was the culprit, I’d mention it to your doctor. Taking it in the morning can help with the sleep stuff, as well as exercise.