Loosing sleep

I don't know if its because the holiday excitement or the pregnancy, but I am tired and can't seem to sleep. Part of the problem is I am already having trouble getting comfortable. I am a tummy sleeper, and that position is slowly becoming painful. So I have no energy to spare. I also have the most horrific gas so stand clear! I have no idea why. I have had problems with constipation, but adding whole grains to my diet have almost eliminated that. So I don't know what I've eaten, but it is bad. Worse at night so just don't crash in my room! I can't get rid of the nausea no matter what I do. I have to eat round the clock! I am freaking out cause I feel like I am gonna get so fat, and I am already overweight! I know I shouldn't worry about it, but I can't help it. Having two kids already has taught me how hard it is to lose the weight once its on!