Getting pregnant

I am having a hard time creating thoughts about trying to have another baby. We’ve been trying for almost 2 years. My sister in law found out she was pregnant, which I was able to work through, however, she just told us she’s having twins and I am having extreme anger and jealousy at this. And ofcourse sadness as we haven’t conceived. I’m trying to find a better thought about this.
C-sister in law pregnant with twins , I am not pregnant
T-its not fair, why does she get everything
F-angry, sad, upset
A-overeat, over drink, am snappy with my family
R-not pregnant, using buffering and body is not as healthy as it could be.