I was going to post info. about this and saw this thread from awhile back. It seems that many women have thyroid issues and this causes weight gain. Sometimes traditional medications help and sometimes they do not. There is some controversy with reference to proper levels and whether or not Armour Thyroid is "safe," to take. However, it seems to me if you have all the symptoms of hypothyroidism you should be checked. AND if you are hypothyroid and Synthroid isn't helping you, then you should look into Armour.
Here is an interesting link:
http://www.stopthethyroidmadness.com/flyer/