You could call him and inform him that you're not feeling all that great, but that you're not really interested in getting anymore steroids, but that you just wanted to keep him updated in what's going on.

They dont require that you take steroids for a flare, they can suggest it, but it is your body, and if you dont want the steroids doing all sorts of wacky stuff to you and just want to ride out the flare, that's your choice.

But, calling him and giving him an update never hurts. At least he'll have it documented then.