Oh @justcantstop, I really feel for you..i felt sad reading your post and totally understand how you feel about the 'old' part. I had an abortion at 19 and if I didn't I would probably be a grandmother by now. Instead my path is this one and I'm here doing donor egg just like the rest of us. It saddens me a lot that I've had over 60 eggs removed from me and nothing from it. We all carry our own sadness and regret. I wouldn't worry too much, hopefully you have some left over embryos.
As for hysteroscopy, its probably a good idea. I had the saline ultrasound thingy done for the American clinic I was going to, which hurt like crazy, they fill up your uterus with saline and a balloon to see if there are any scars or adhesions. It came in handy for my Greek trip, but I was not asked to do it, luckily I already had it done. I would suggest you get that done. I think you will find you will be lucky the 2nd time around.
As for lining, I got pregnant on a 7.5 mm lining...as Dr Kanakas said, its not the size but the quality, not only of your uterus, but also the embryo. I would get the tests required and hit it again as soon as you can afford it. Don't give up, be a hard head like me and don't stop till you get what you want ! A baby of your own. It will happen, just be patient and know that its not just one factor, but many, that are sometimes out of your control. Dr Kanakas would have been genuinely upset for you, hes really sympathetic and has so much empathy for us women trying to have babies. I plan to go again next year and have already decided that if it doesn't work, I'll keep trying till im 50. I have a 4 year window, after all, I want a sibling for my son. Hes not even out of my womb and im stressed, wondering if he will survive, I just got the whooping cough booster shot and I was scared it killed him. Talk about paranoid ! You might be worried now that it didn't work out, but trust me you will be 10 times more worried when you DO get pregnant. I really hope you try again soon, and don't give up.
Love and good wishes from me to you xxx