It sounds more anxiety related than health related. The pills are about as useful as a magic talisman would be, probably. Can you not relax around the whole issue, and propose to your wife that you just have a few nice nights of relaxed contact without the plan to have sex? Performance anxiety is sometimes treated with meditation or hypnosis, it doesn't really sound like the way you are approaching it (all those pills) is helping. It's like you have convinced yourself that without a pill you won't get an erection, but you're afraid even that won't help. The mind is very powerful, if it has the sneaking fear a pill won't help, the pill probably won't help. Talk with your wife about your performance and your fears, and see what she says.
well get more advice from the doctor.