Hi,
My heart goes out to you. I also have endo (scraped off fallopian tubes and bowel) and PCOS, as well as a benign pituitary tumour for which I have to be on medication to GET pregnant, but have to come off to STAY pregnant (and risk the tumour growing).
I'm 35 and have had one miscarriage, and am actually waiting to have another right now.
I have been TTC for a year.

This is not hopeless though: I have found using Clomid eventually helped me ovulate, and using ovulation test kits helped me predict when I was ovulating so I could time sex exactly. I also used a sperm friendly lubricant to help things out down there (Clomid can dry you out, and most lubricants actually kill sperm).
I don't know why I'm miscarrying right now, but it's not the endo/PCOS/tumour. Strangely enough, the most helpful thing I did for my endo was become a complete vegetarian (sounds weird, but there is Scandinavian research suggesting a link with hormones ect in distressed animals contributing to endo). I don't eat any meat/seafood, but do have dairy and organic free range eggs. My diet is about half organic, so I'm pretty healthy. This and exercise, along with the occassional evening of drinking way too many Expresso Martinis and dancing with my gay boyfriends til the early hours, is surely helping!

Keep trying, and let me know how you go.
Faith