Zero sex drive

Hi ladies I'm 45 years old and have zero sex drive. Anyone else experiencing this? Are there any safe herbs or vitamins to take. I don't even get orgasm anymore. I'm heathy, active and pretty fit. I don't exercise everyday but try to stay active by walking a lot. I eat healthy as well. It's like my SD gradually diminished and now nothing. I do have some sign of premenopause but I didn't think my sex life will be effected this soon. It's really devastating to not enjoy sex anymore.