I started taking doxycycline 100mg once a day for acne. Around the same time I started having softer BM's on and off and now today some sharp pains at the belly button area. I am worried that I may be starting to flare. (I've been in remission over a year now) Should I call my GI and tell him I started the antibiotic or wait and see? Has any one else experienced a flare after taking antibiotics??