To be honest, I'm not sure exactly where you should be posting... But, it's no big deal you stopped by here. This site is all about support and we can sure do that here in IBS.
Pain and blood in the urine can be caused by so many things: kidney stones, UTI's, viral infections, medications, random kidney inflammation, strenuous exercise, sometimes even no cause is found... etc., etc.
I know this is easier said than done, but try not to worry too much about it just yet. Given that the antibiotic you have taken twice before has helped you, there is a pretty good chance you just got some type of infection (viral maybe).
Go for the further testing and try to keep a positive attitude. Good luck!
Co-Moderator IBS Forum