Antibiotic treatment for ulcer&uti now i have ibs symptoms. i think imbalance is to blame. how do i restore bacteria balance? which probiotics to use?

Antibiotics: It is not unusual for antibiotics to cause changes in bowel habits, usually diarrhea. This is often due to the antibiotic itself, not necessarily to an imbalance in the gut flora. You can try yogurt or probiotics such as Align or Florastor, but I wouldn't necessarily expect them to work until you are finished completely with the antibiotics. Do not stop the antibiotics early. Good luck.