I'm 36, no history of any GI disorders or irritability ever before, and on oral antibiotic therapy for Lyme Disease. A few weeks ago I developed quite severe IBS symptoms which are still with me (alternating constipation, diahorrea, cramping, some heartburn) following on from a phase of vomiting due to not taking the antibiotics with enough food. I'm thinking of switching to IV treatment.Has anyone else (with no previous history of gut irritability) had similar experiences? My doctors seems to think it will go away in a few weeks once I switch off oral antibiotics. Do you think he is right?