if you've been sleeping outside, sometimes when you roll around, a bit of twig or dirt can lodge..
if you can't get a doc to do it (ahem..) probe the canal very, very gently with a thin,narrow loop of wire ( a bit like a a sqeezed paperclip) DO NOT USE AN OPEN END PIECE OF WIRE!! bend it in a bit of a hook shape & be carefull...
if it's in the canal, you should feel it.. at any point of pain, STOP!!