Definitely don't keep trying to find out and put some poor girl through that, I've been that girl and it's kiind of a major letdown to get all horned up only to find out that your guy has dope dick. Again.
Stop taking opioids and your dick will start functioning like it should, maybe even a bit more sensitive (I've found this to be true). Or get with a chick who understands and uses opioids as well. It'll be more mutual than if she was clean unlike you.