Suffer retractile testicles after inguinal hernia surgery. will this go away or stay like this forever? it's been 2.5 months. any tips to make it go?

Should stop: I admit i don't have any research to quote you, but in my experience this somewhat atypical problem should be self limited. You could try applying warm heat to the scrotum, in the privacy of your own home, of course. This would cause the cremasteric muscles to relax to drop the testicles away from the groin. It's worth a shot. Good luck.