No sex drive

So I have been with my boyfriend for 5 months , the first 3 months we had plenty of sex, practically everyday sometimes more then once a day , but the past few months I have had just no sex drive at all.... I just don't want to have sex anymore at all, it doesn't sound pleasing to me, it sometimes hurts when we are having sex ( even if I am wet), it will hurt for days afterwards as well, it hurts when I pee.... It all feels like a burning sensation,I don't get turned on anymore or ever feel horny , and generally after I have sex I just feel very depressed.... When I was 15 I was told that there is a high chance I might have endometriosis because of the extreme amount of pain I get on my periods .... Some months my periods are still that bad but some I can manage, my ovaries also cramp sometimes when I'm no where even near near my period ... I don't have the money to go to a gyno , please can anybody help? Me and my boyfriend have fought because I won't have sex with him....