Beginning to feel very low

So me and my partner have been trying for 2 years to conceive and I suffer from POCs since I was 13. No matter what we try or do it just doesn’t seem to want to happen. I’ve been to the doctors and so has he and we have had numerous tests done which don’t indicate why we couldn’t get pregnant. Anyone suffered the same sort of thing? I can’t help but really down and upset when I come on every month. Xx