Feel like giving up

I feel like y'all would be the only ones who would understand.  My SO and I have been TTC our third child for the last few months and nothing. My youngest is about to be one in two months and I am so tore up about that. The last time we TTC it happened the day I got my IUD out and now nothing. I get my hopes up every month and then Aunt Flo comes to visit and I get so down and depressed. I hate having this feeling that I'm never gonna get pregnant again.