Jealousy due to being infertile

My husband has two children with an ex. I love them dearly and have never and would never be rude because of this.

But we've been trying to conceive for 8 months (my doctor says that if we do conceive its likely it wont stick) to no avail.

I'm filled with such anger and jealousy. I'm not directing it towards anyone so it's just festering. I'm absolutely miserable. I'm jealous of the bond that he and his ex have. I'm jealous that they had two happy healthy pregnancies. He seems to be growing impatient as well. I feel as though I'm not as attractive anymore. I'm jealous of the bond people have with their children.

His ex has rubbed it in my face twice now.

I'm just sick with anger and jealousy

I can't let this make me bitter but I feel like everyone is just slapping me in the face with it.

Does anyone have a similar struggle or advice?