Best of luck with your appointment tomorrow,I hope it goes well for you!
I don't have anything much to add to all the wonderful posts from the others, but if you are nervous ,rescue remedy is great a few drops on the tongue half an hour or so before appointment.I find this stuff great,or just a few drops on the inside of your wrists.
I was nervous so I took magnesium to help me relax and used
natural progesterone cream on my neck,it's also great for men.
I was really sick after my first appointment (before I found this website,all their great advice made the second visit much smoother.

Top Tips,take some activated charcoal before & after visit,
cover up as much as possible during procedure and change clothes asap after,and wash all clothes you wore asap,and take a shower wash yourself from top to toe, to wash away any mercury vapour.
I was going to mention taking lots of vit C after but I think you mentioned you can't take supplements well at the moment,was that you?

Anyway I just really wanted to say Good Luck!