aaahBOOOOOOOOO!!!!!! pooey! man does that STINK!
what it sounds like to me??????? it sounds as though you injured your shoulder joint.
this might be from "injury" like overuse. like you mos tlikely already know...with RA there is a higher than norm risk of joint injury from normal activity. So you might have done a household task and pehaps did an "overuse" joint injury that made it flare up.
a film of the that area wouldn't be a bad idea...like the above mentioned rotator injury...or muscle/tendon/ligament.
especially since you really REALLY don't wanna go on pred...if i were your doc, i would have suggested a film to look at the area first before just pawning you off on prenisone (which i'm finding is an easy-way-out-answer for docs nowadays)
oy! i know you must be P.O.d about this
{{{{{{{{{{ big hug }}}}}}}}}}}}