RE: Have I damaged a muscle or is this normal?!
DOMS rocks! Yeah, it can hurt like an SOB, but you know what they say..."Pain is weakness leaving the body."
Anyway, ditto on the whole your first time hurts the worst. It gets better with time...and you learn how to live through the DOMS.
If it's really bad, try a ten minute shower flipping from really hot to really cold every two minutes.