Re: My digestive system has been completely messed up ever since visiting China while on antibiotics and getting diarrhea there (7 months ago).
In the gastro world Flagyl and Cipro are usually pres ribed for protozoan infections and bacterial ones. You must find out what bugs or imbalance do you have.
Re- what good bacteria did you lost the answer is not that simple and precise. Dont focus on that.
Thyroid disfunctions (your TSH) come along with gut issues so I would try solving that first. The gut issues. Maybe try to see your adrenal state also. Long term infections give hipoadrenia also. In fact even one week its enough for some people to develop hipoadrenia from a bacterial infection.
Common is right - make your best and test if you can. Just guessing was not enough for me.
Wormwood can help you with some but not with all of them.
Besides The labs Common recommended Some people had success with dr.Amir lab in Arizona for
parasites testing but i guess you have now also bacteria imbalance.