I have an autoimmune disorder and i want to warn you that stopping the steroids may cause your condition to regress quite a bit. I have used corticosteroids periodically for my condition and it helps cover the condition during disasters but theyve never caused the condition to go away, it always comes back after i stop them. Albeit in a better state i can manage more easily, but it's 100% possible to regress all the way back.

So please be careful after you're off the corticosteroids to not restart the things that might've contributed. Good luck, autoimmune disorders are hell.

Yes OP should be careful of PEM (Google it). Do the bloods other commenters but I'd pace until you know what it is even if feeling OK. Pace E.g. Go shopping come back and be still for X time (depends on you) and have recovery days