Giving up

Me and my husband have been ttc for over 2 years now we did manage to get pregnant back in December but unfortunately we had a miscarriage. I have pcos and I have been on 50mg of clomid with no luck my periods are never normal i may go 9 months without one and bleed for 3 months but with clomid i was kinda normal with my periods but this month my period was due last Sunday i have taking 3 test all negative and still no AF. I don't know what to do anymore. I really am tired of this fight all i do is cry I'm so miserable with life and many days I no longer want to be here i try to keep going and thinking of the good things in my life but being a mom and having a baby is all I want. Any words of encouragement would be great :'(