Losing weight for 2 years now!

I'm a 23 year old male. I began having stomach problems in the beginning of 2008. My weight has dropped from 190 pounds to 150 pounds and I look weak. Earlier it was severe bloating and unformed stools and now it's mainly unformed stools, some bloating and sometimes indigestion. I don't consume milk and milk products and have tried all sorts of doctors. Have also taken so many antibiotics. They have a temporary effect on me but the problems return a couple of days after I stop taking them. My present doctor prescribed Rifaximin which I was supposed to take for 2 weeks during a trip overseas last month. They worked great, my digestion was almost perfect. I had everything on my trip, right from milk products to nuts and grains! And I actually gained 6.5 pounds on my 25 day trip. Unfortunately, the problems have returned and I'm beginning to lose weight again. I have stopped taking milk products again.

I have gone through almost every test and scopy available and nothing but very mild andral gastritis was found and ofcourse, unfriendly bacteria in the stool test. Since I've returned from my trip, I have a feeling that the problem has been dysbiosis. I can't be taking antibiotics all the time.