Synthroid and risk

I was diagnoed back in november with Hashimoto Disease and had a complete thyroidectomy in December. I have been switched three times since Dec. 07 (only April 6 '08) to different doses of Synthroid. I still experienced weight gain and cannot lose weight, irritability, depression, hair loss, exhaustion... I decided last month to stop taking it all together and was wondering what effects this may have on me. Any clues as to the effects of NOT taking the medication after having a my thyroid completly removed?? I feel the same (depressed, irritable, still losing hair, exhausted...) but am sure this is probably not a good thing to not take any medication when I don't have a thyroid anymore.