I feel for you OP and I'm sorry for your losses
We TTC 12yrs, no cause for sub-fertility found and I lost 3 pregnancies. We did several rounds of IVF. The last we had ICSI. By then, DH was late 40's, and on the day, he was at the start of getting a viral cold/flu thing.
The way I got through, was thinking of the positives. Yes, I realise this sounds odd. I saw IVF as a chance, rather than a last stop! Some positives I thought about:
-I lived in a modern country with free health facilities, had the opportunity for IVF, ultrasounds etc
-I had a chance to keep trying. I hadn't had a hysterectomy/life limiting illness or some other reason I might not be able to conceive and have my own children
-DH and I had our health, and my losses were mainly before I showed and had told many people.
In the end, we have no living children. I did look into donor eggs for a time. DH and I have a great life. It can exist, even without living, biological children. I haven't discounted adoption/fostering in future, but at the moment, we are very happy and fulfilled. Since childhood, I thought my life would include marriage, 2 children, a house etc. Yes, my life doesn't have the children, but is no less fulfilled and happy. I obviously hope you do get the children you want, but know that in some cases, it just doesn't happen.
Just remember OP, that this isn't your fault and your are not alone. Happy to answer any questions you might have x