Is it ever going to happen?

I had a miscarriage in June 2015, my husband and I have been ttc ever since December 2015 I kno that it really hasn't been that long but it feels like it has been forever that we have been trying every month I get excited and then I start freaking out because of the small window of time for fertility and I kno that stressing dose t help but I feel like that is all I can think about. Every time my period shows up I get so upset I cry myself to sleep the first night I am so disappointed and hurt I honestly feel like there is something wrong with me and I am broken, will this feeling ever go away? Some people call me selfish because I already have three beautiful children but four was always our magic number and I still feel like someone is missing from our family😖