OK, so I'm having a bit of a problem here...
Nearly going on a full year with my girlfriend, who I thought was the one, but lastnight I was thrown a curve ball that I wasn't ready for...

Let me explain something first...
About a month before I started dating her, I had injured my sciatic nerve, and since then, I've been having problems "Down there." I've gone to a couple different doctors about it, but they all act like I'm out of my mind, because nothing seems to be wrong with me at my age of 29. They just throw free samples of Cialis and send me on my way... And no, the pills don't do anything for me...
So obviously, my sex life isn't great.
She seems understanding, but she's always craved sex... So when I do have a successful night where I am working properly, it's not enough... She always wants me to go all "50 Shades of Gray" on her, and I'm just not into that stuff... I'm very vanilla when it comes to sex... Every time I try to give her what she wants, I get turned off, and I fail at providing her with what she "needs."
Outside the bedroom, she is my Goddess. I take care of her to the best of my ability, and her needs always come first.
I'd like to believe I'm the epitome of "The Nice Guy."
Well, lastnight after I take her out on a very nice little date, we head back to her place, and we start to play around... It was supposed to be a nice evening of just cuddling, and a nice long session of intercourse, but my little guy wasn't acting right as usual... Well, she became very frustrated with me like I'm able to control this issue, and began to tell me that she's been patient with me this whole time, but having to go without the sex she wants for so long, she's losing hope.
She proceeds to tell me that she doesn't care about the dates, and all the time we spend together, that all she really wants is ****.
To me, that was a slap in the face, because I've tried to hard to give her what she wants in every aspect, including sex, knowing damn well that I have complications, and while I've spent a year of my life wanting something special from her, she basically tells me that all she wants from me is to treat her like a piece of meat...
Now with a week before our one year anniversary, I don't know what to do... To be told that all she wants is sex, my feelings for her seems to have vanished. I believe if **** is all she wants, she can easily find it elsewhere, so why bother continuing on with this relationship?
Am I wrong for feeling so disappointed knowing that the only thing she really wants is something I just can't give her?
She acts as if she loves me so much, but after lastnight, I'm convinced she's confusing love with lust.