I agree with killcolitis. Did they do a strep test? I wouldn't take any antibiotic without a definite diagnosis.
I had to take the 6-dose Z-pak in August for a dental abscess and root canal - sent me into a horrible flare of my crohn's colitis, from which I still haven't recovered. I'm now switching to Cimzia from Humira, which was doing nothing to put out my flare. The Z-pak also sent me into a flare in 2003 - ended up in the hospital.
Somebody will have to do some serious convincing before I'll take anitbiotics again.
Good luck,
Jan