I have the same problem with being bloated. I lost all my pregnancy weight so fast without doing anything, but all of a sudden I recently gained 15 lbs. and I look pregnant, but I'm not. It turns out I have 2 cysts on one ovary that are causing me a lot of trouble. I would suggest they give you a lap to see what is going on. Just remember that a lot of doctors don't really understand how to handle cysts/endo so it's a good idea to find a specialist if you don't think your doctor is doing a good job.
The bloating won't go away until the cyst is resolved or removed. Why did they give you antibiotics? Do they feel the cyst burst and are being precautionary? It is not the usual treatment. What is their plan? What size is the cyst? Are they planning surgery?