Hi,
I am now 10 weeks with our third, and I too have been soooo exhausted and also quite sick....not barfing or anything, just a feeling of gut rot all day. It seems to be getting better, but I have the same fears as you....I can't squeeze into my jeans anymore, and am just down to sweat pants. I looked at my maternity clothes today and they look huge and out of style. Looking forward to a little shopping!
I have kept up with working out about twice a week, and basically just running. I've tried a couple of weight workouts, but felt exhausted instead of invigorated after. Prior to pregnancy I was working out 6 days a week, alternating weights with cardio. I am enjoying my runs, just finding a time, usually on a weekend where I have a bit of energy, and I just take it slow and easy....it's weird to shift the focus from burning calories and really pushing my body to just enjoying the half hour of running and listening to some good tunes. I am hoping in the next couple of weeks to try to add in a weight workout, but we'll see. I bounced back pretty well after the first two, but I'm older now!
As for the eating, I am in exactly the same boat! If I snack when the sick feeling starts it helps alot. I haven't weighed in yet, am trying not to panic! Right now I love Triscuit crackers for carbs....they're pretty low in fat, I think sodium is not to bad, and it's better than potato chips!!
Anyway, I'm not a regular here, but I find it helps so much just hearing that there are others out there who are feeling the same as I am helps so much!
hang in there!
Shelley