Sex drive?

I'm just wondering if there's anything I can take or anything I can do to help with my sex drive? I could really care less if I have sex or not. Ladies please help. My marriage is on the line. My husband is starting to get really frustrated with me because I never want sex. What is wrong with me? When I do have sex with him it's only to shut him up. I never feel the urge for sex anymore. I'm 35 and always heard your prime is in your 30's