Thanks for your reply What you explain is certianly reassuring and if I learn anything new I will post it back on this thread. Thank you for the service on this site as there is a good deal of useful information in this forum.
Welcome to our Forum. Mycoplasma genitalium is a recently recognized microbe which may be a cause of urethritis in some situations. Just how common it is and its role as a pathogen is a subject of continuing study. I can see from your question that you have research the possible causes of your discomfort and therefore I will go directly to your questions.
1. Treatment response to azithromycin is, indeed, less than 90% and thus, if MG were present there is a chance that you would not have responded to care. However, if MG were present and causing your symptoms it would be most unusual for there not to be SOME sign of inflammation in your multiple urine tests. This would present as a significant number of white blood cells detected in the urine. That this was not seen makes MG far less likely.
2. See above. Tests for MG are not widely available and currently are largely research tests. On the other hand, it would be expected to see and abnormality.
3. No, see comment below.
4. My goodness, that was an aggressive work up. Glad it was negative. These problems do not bring to mind any specific STD.
A final comment. You may have had NGU. If so, sometimes complete resolution takes a while but you are now out beyond where symptoms would normally be seen. you have been tested on several occasions with negative results and treated with no lasting relief. Sometimes after an exposure that, in retrospect, one wishes they had not had, persons tend to examine themselves and be far more attuned to genital sensations than in periods when they are not concerned. This in turns leads to noticing what turn out to be normal sensations that might have been not noticed or ignored at other times. Perhaps this is a contributor to your situation. Just something to consider. Most importantly, with the test results you have, I suspect this is not something serious and is not an STD which puts you or your sex partners at risk for further problems or complications. EWH