I am sorry you are going through this - I had a D&C just under a month ago at 12 weeks-ish and the m/c was completely unexpected also.
Personally I found the procedure to be painless and recovered quite quickly as I do not seem to be affected by general anaesthetics much. The biggest shock for me was the depression afterwards - I quickly came to terms with the loss of the baby (in my case it was a blighted ovum) and was actually relatively cheerful the day before but still found myself terribly depressed in the days that followed. I guess it was the hormones playing havoc. This lasted for about a week, off and on. Try to surround yourself with as much support as you can (from partner, girlfriends. etc) as you may feel very fragile afterwards. HTH

PS: It is a bit TMI I know but be prepared to remove your underwear and any pad you might be wearing just before you go into theatre.