I would check out WebMD.com or make a phone call to a Urologist (sp?). I will speculate that antibiotics could have changed something, but I am no expert.
Aren't you reducing your own sexual pleasure by worrying about something that you can't do a thing about? I seriously doubt there is a pill that can make you have stronger orgasms again. If so, I would imagine we would know about it.
I think that if you relax and are thankful you get to have sex 4 times a day, that you will be blowing holes in the wall again in no time at all.