I don't want to panic, but that's what I am, a panicker. The game recap http://www.baltimoresun.com/sports/baseball/bal-sp.orioles02may02,0,3220727.story?coll=bal-sports-he adlines
says that he has forearm pain, which Buster Olney points out in his blog is often a precursor to elbow tendon injuries. Tommy John-type stuff.
Since the guy who would most likely replace him already is having elbow surgery, this probably isn't good news.
sigh. Let's hope it's just minor.