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The prednisone and plaquenil may take a couple days to begin making you feel comfortable again. If you are in a lot of pain now, you should return for another injection, which should last at least as long as the last one. A higher dose would likely last longer and give the oral meds more time to kick in.
That could be the effect of the prednisone withdrawal or the disease process flaring up, possibly both. If you can't get in for another injection, you should use cool compresses on the joints that are painful or swollen. Keep the hands elevated above the heart if possible to reduce swelling and crowding of the nerves. You should also call your doctor's office and ask if you could increase the prednisone dose for a few days to increase its effectiveness, at least until the plaquenil begins to kick in and the disease process settles down.