Cath hun its easy to feel overwhelmed by it all, and i bet you are thinking that the appointment might show up something wrong with either of you, and your nerves and anxiety are about facing that. BUT, i bet you there is nothing wrong with either of you and thats just been bad luck.
Once you know that you can feel positive about TTC again knowing that you will more than likely have a perfect pregnancy next time.
I understand how you feel about being close to giving up though. I was after mc no 2, but decided that if i gave up that all the pain wed been through would have just been for nothing x