It hurts so much

I’m struggling pretty bad trying to conceive, I have PCOS and I honestly never thought that getting pregnant would take this long. It’s been about 7months since we first started trying and it hasn’t gotten us anywhere , I am such a failure, I have found it so hard to stick to the PCOS diet. I have to have sugar and with the PCOS diet my doctor gave me you can’t have sugar, I really don’t know what to do, does anyone have any suggestions on what to do, or what would help get me pregnant?!