My gosh! Go back and read all you have on your plate, I would say you have a reason for feeling the way you do, even if you didn't have hypothyroidism or were pregnant. If everyone isn't helping you out in your household then you need a family meeting to get everyone on track. Dad needs to be the one to get the ball rolling. If he doesn't, then have a little pow wow with him and help him to understand that things need to change pretty quick, you are falling apart in case he hadn't taken the time to notice anything except the crying. If someone else has to cook the meals for a bit, then assign them to it, or do their "own" laundry. Delegate delegate delegate until you are doing better and even then they can still do their part. As long as they are human they can work to help you with the household stuff. Once everyone is helping out and not adding to the problem then things should get better for you. Make sure you get enough rest, no matter what.
Now, go put your feet up and take a break. "If mom ain't happy then nobody's happy" is very true. With some of the load off you, there can be more "happy" in the house.
I wish you the very best, and admire such a superwoman, but that superwoman needs to take time for herself. Find you a close friend and cry your eyes out until you get some of this stress relieved.
Tons of Love and Understanding,