Bump, I can totally relate on the extreme tiredness. Nothing hurts, yet, for the past three weeks I couldn't even sit at the computer at work for more than two hours, was almost crying, I wanted to go home and lay down so much... However, on a positive note, for the past couple of days I felt a little more energy, so really hoping it will get better from here on.
About the weight gain... I am also terrified. With my last pregnancy I went from a pretty slim 140lb (I am 5'8" or 5'9") to a whooping 218lb AFTER I gave birth (must have been like 230 or so before I gave birth. Holy shit, that was so bad. But it was partly my fault. I was eating bad stuff, and working at a fast food place didn't help.
So - this time, I am starting with 192lb (feel devastated as I weighed 140lb only a year ago), so I am beyond terrified of how big I will get. And the thing is, it is NOT what my body is used to. My normal weight has always been 135-150lb.
I read a lot about trying to handle your weight during pregnancy, and I decided for myself that I will try to stay under 200lb until the end of this pregnancy. This means I have to be losing weight instead of gaining. I know what a lot of people wold think about that, but this is my decision and I think it will be for the benefit of everyone (me, babies, my family). My plan is to basically eat healthier, much healthier, and to walk long distance once a day. I have to refine my plan a bit as far as exercise, but this is the start. My next naked weigh in is next week!!! Hopefully it will be at least 190lb!