Ouch! I know how you feel, its a bit testing, isn't it?
I don't know exactly what's happening to mine, but one has become particularly sore up to the armpit that has developed into a swelling and a redness over the last few days. Oh joys of joys! Fingers crossed it goes away.
And just when you thought you things might ease up a bit, there's yet another symptom to add to our list!