Ah Nic,
I'm so sorry, what an awful experience. Your GP's right, it's no wonder you're feeling anxious again. It's bad enough for most people but when you dwell on things as much as we do, it must be hard to get it out of your mind. Meds are there to help do if you need some diazepem, don't worry about taking it - that's what it's there for.
Obviously, I've not been in your situation so I don't know how it feels. What I do know is that however bleak things can seem, they always get better given time and a resolve not to give in. I think you really do need time and plenty of support from your family (and your friends on here of course).
I'm always around if you need me and think I can help. PM me or post here and I'll always get back to you.
Big hugs
Pip xxxx