A road I know well.
Hi, I am hypothyroid and I can tell you it is an uphill battle. First if you can not go to the Dr. and I understand that being a single mom with no insurance, I would suggest trying cold press virgin coconut oil, I have heard it helps and I just bought some myself.
Somethings in particular interfer with thyroid Goitrogens can disable the thyroid by blocking the body's ability to use iodine this includes broccoli, cabbage, soy products, mustard, turnips, cauliflower, brussel spouts and a few others.
Also I have been told that the flouride in toothpaste and tap water can interfer with thyroid functions. Floouride is used to treat Hyperthyroid so it is a bad thing is someone who is Hypo.
The battle with thyroid can be a long hard road so if you suspect thyroid is causing your problems try to educate your self before you see your Dr.
I will not bore you with my nightmare story but please educate yourself on what normal thyroid levels should be. The medications used to treat thyroid. What you should and should not eat. about.com has a site for hypothyroid and it is wonderful.