I never get a positive ovulation test

Guys I am struggling. I feel like I never get a positive ovulation test, EVER! I test morning and night from one week after my period until I start feeling period craps (about one week before my period). I am 99% sure I have endo but I cannot find a Dr that is willing to operate to confirm the diagnosis. I have very ttc for 2 years with no luck and I am getting nowhere with any health care professionals. Everyone has agreed that I have endo but no one will help me get rid of it.

I am worried that I have endo over my left ovary (this is the area that I get extreme pain) so I am not sure if I am actually ovulating or if my endo is preventing it?? My test line gets darker, but is never really dark enough to be a true positive. Any experts out there willing to help??