I think you diagnosed your own problem - Viagra, Cialis & Levitra all work by increasing blood flow to the penis, then you add the Nitric Oxide booster & L-Arginine, which ALSO increase blood flow, and you just overdid it. As they say, honesty's the best policy, just be upfront about it & tell your GF what happened, you're in pain, etc., and just say look, I need to take it easy for a week or 2 & I'm sure she'll understand. Just reassure her that it's not that you don't WANT sex, you just need to give yourself a little time to heal. You could still see her, you could please her manually or orally, she'll love that & I don't think she'd stray. She'd probably be impressed that you cared enough about her to take care of her needs even though you couldn't get off yourself until you heal. Good luck!