As someone who struggled for years with infertility, I see you. Adoption and fostering can be rewarding, but I understand fully the thought of wanting a child of your own, and the utter despair of knowing you had that choice stripped from you. The feeling is completely gutting, and that pain doesn't go away. I am so very sad for you and the loss you're feeling. It's a hard feeling to empathize with unless you've been there. It's a pain different than any other pain you've experienced. You are not alone
I'm not sure how long ago you had treatment, but if it's feasible for you, I would try and get tested to see if you have any viable eggs left. Just because you don't menstruate anymore doesn't mean that all your eggs are garbage. Surrogacy could very well be in the cards for you if you have access to the proper channels. I know it sucks that you wouldn't get to experience pregnancy (if this was something you're missing), but it would still give you a chance to hold your own baby.