Thanks all - slowly sinking in a bit more!
Good luck for your scans/appointments Liquid and Carrot. Super and Vicky - think it's natural to fear the worst, I know I did, but in all likelihood all will be fine. I wonder if 'thinking the worst' is a defence mechanism to protect us from being absolutely crushed if there is bad news? Vicky- I've read MS is often much worse with twins but I only had about 5 weeks of nausea and headaches and although that wasn't nice at all, I was only sick a couple of times and it had pretty much gone by week 11, so as Eliza says, it varies and some people are just lucky.
Saying that, the beige stodge is still featuring heavily in my diet, although fruit juice and fizzy water has definitely made an appearance and I can face normal meals and veg again. Can even be in the same room as a cup of coffee now, although still can't bring myself to drink it again yet. I did read something last night that made my day - apparently if you're BFing twins you should eat up to 4000 calories a day 
I suspect that's an exaggeration but would be nice to have a bit of help to lose what will no doubt be a fair amount of weight! Speaking of which, Clever - have you been sick in the early weeks? Anything else that could explain it? I don't think they expect you to gain until a bit later on but if you're losing for no reason might be worth seeing someone. A friend of mine lost about the same in her first 12 weeks purely because she'd stopped drinking wine, but then she did drink a fair bit!
MTMD, hope you manage to see you MW and all is well.
Sorry for the enormous post- things move fast on here!