Sex isn't the same

I've been with my guy for 7 months now and sex was always amazing! Now it's been different, not because of him but my vagina instead. It's so irritating! Last two weeks it's like he's just not doing anything for me when we have sex. It happened last month for a few days but after the few days it was amazing again. He doesn't have any complaints other than he can't last long with me. My hormones are going crazy and I constantly want sex, more than normal and that's a lot as it was. Does anyone else do this? Why is this happening?! I can't stand it! If things feel great for him in me why am I not feeling pleased? Any tips on what I can do? Foreplay and spicing things up isn't a problem. Nothing is working for me!