Oh Carrie
Did you know how many people have prangs in Supermarket Car parks?
Thousands. We've had about six ourselves.
It's just something that happens unfortunately. Don't beat yourself up over it. x
Maybe it was not the right time to have the OP. I normally say that things happen for a reason and as you sound really stressed, it's probably a good thing it is being re-scheduled. I don't think you can prepare yourself mentally. You are going to be scared no matter what. The best thing you can do is use this time to relax, eat healthy and get plenty of sleep so you are in best form for when you do have it done.
I feel for you, I really do. All my hates. Hospitals, doctors, operation, trust issues, recovery issues. But, your mum will help you through it all. x