Sometimes pregancy can cause thyroid problems. Most of the time it gets better.
I've also noticed alot of people on here who have ulcerative colitis and thyroid problems.
As for the sleep trouble you might have sleep apnea. Hypothyroidism causes sleep apnea in some people. I have both of these pests.
Ask yourself these questions:
Do I fall asleep when I sit down for a few minutes? Do I find myself yawning all the time? Does it feel like I wake up every few minutes when I'm asleep? Do I snore? Do I fall asleep while riding in a car? Does it feel like no matter how much sleep you get it doesn't feel like enough?
If you answer yes to any of these questions please get a sleep study done. My doctor said I was stopping breathing every two minutes, which was putting stress on my heart causing it to enlarge.