I seem to recall Tetracycline doing that to me also many moons ago before I even had Crohn's or Celiac.
They can do that to ya. Usually listed as a possible side effect on all antibiotics.
Not sure if it would work for your issue, but amoxicilin has always been the least offensive to my GI tract of the ones I've tried.
Type I Diabetes- 29 yrs. (MiniMed Insulin Pump)
Celiac Disease- 8 yrs.
Crohn's Disease- (Nov. '06)
Remicade (First Infusion 11/3/08)