wats the name of the drug you took ?
James,
Sounds similar to my case. I took 2 rounds of 2 different AB's at about the same time. It started with constipation, but that has subsided. I still have abdominal bloating. I avoided gluten and lactose for a time but no change in my condition. You may want to consider researching candida. It's yeast infection. Just like bacteria, we have yeast in our digestinal tract and it is kept in check, normally. AB's can through that out of balance too. I recently took an anti-yeast drug but I don't think it's working for me. Maybe it will work for you.
In my case, I find temporary relief from belching after drinking carbonated water and taking peppermint oil. I just pop 3 Altoids at once or drip some peppermint oil into my water. It available in the natural supplements section the grocery store. But be careful. Too much p'mint oil can hurt you. I will continue to monitor this message board and wish you a speedy recovery.
Godspeed,
Carl