Im new around here, but it sounds like you may need to see a gastro MD. If you have one, maybe you could switch. You may need testing done in case the long term antibiotics have damaged lining of the esophogus and stomach. You can treat that. I just had a endoscopy and colonoscopy done at the same time and they can see everything. Constant hunger can also be a sign of an ulcer. There is lots of info on the internet about side effects of your medicine too.
I know from being on hormone therapy constipation is a big issue with me and I take 2-3 tablespoons of sugar free citracel every morning mixed with cold water. I really helps me alot. And it is natural, not habit forming. Prunes and dates are also helpful. Also, drinking lots of water is important when you are constipated.
You might want to consider taking prevacid for acid reflux. You can buy that over the counter and try that. But it sounds like you really need to see and MD to find out whats going on.