I have recently lost interest in sex? 25 yrs, no new meds, just a lot of stress. I used to have a high sex drive, now its rarely there. Whats happening

Hormone levels. Of course you should evaluate your relationship as well as environmental stress which probably lead the pack for loss of sex drive. However, many women your age are on birth control pills which increases the sex hormone binding molecules that carry these hormones. If they are not free to circulate, especially testosterone, your may see waning of your sex drive. Have them checked.