Rockclimber so sorry for your experiences, which sound really terrible and must be very upsetting to have to explain how you feel.
Agree with others here.
Also, just remember that the panel have a 'duty of care' (my words, not sure what they would call it) to the child/children you may be matched with in future. That duty of care is to make sure as flowerpowerlondon says that you have moved on and are ready for adoption as the next phase in your life.
As you know the child/children you will be matched with will have experienced a great loss, the loss of birth parent/s and probably foster parents too. They will be grieving for these losses and you will need to be the strong one. No one would blame you for not feeling strong after all you have been through, but the social workers and panel will need to know you can handle parenting a child in these circumstances and your own losses will not jeopardise the new placement. So the questions are to get this all out in the open and not to torment you.
I only had one early miscarriage and it was early and long ago, so for me it is not such an issue to talk about it but I did have a lot of failed IVF treatment where I experienced that rollercoaster of emotions of wondering if I was pregnant only to find I was not each time. It did take a while to get over that and to feel OK about all that had happened. I ahve a birth daughter and so I know I am very lucky but I was very keen to be pregnant again and each failure felt very hard. At our initial meetings with social workers I cried when I talked about it. Now I feel more comfortable and can talk without getting upset.
Now our new son (aged 3) is with us through adoption and he keeps me busy. Our birth dd has been a handful since his arrival. It is good that the sadness of years of expensive treatment is out of the way and in the past but I am glad that I was made to wait when we first asked about adoption, and that we really had to know the treatment was in the past. I may still smile when I see a tiny baby but I don't wish my new son was a tiny baby. It would be very hard to parent him if I still longed for that (in my case) imaginary new baby.
I agree with flowerpowerlondon that I don't think the social workers would have put you forward for panel if they did not feel you were ready. But the panel may just need to explore this with you. It does feel cruel but I think it is for very valid reasons. Panel time is quite short usually, and I certainly felt when I was there with my dh that everyone in the room was trying to ask questions in a nice way, no one wanted to 'catch me out' and at the end when we were approved I felt a real warmth from everyone as they congratulated us. I really hope you will also feel the sensitivity of the group (it must be quite hard asking strangers these personal questions) and that you too will feel their warmth when all goes well. Best of luck.