Thyroid condition! advice please?

Hello!

I have an underactive thyroid. Diagnosed in June 2008.
In July 2009 after many tries with Thyroxine to get the levels right, it finally regulated, then, I fell pregnant!

Since I had my baby its all over the place. Im still in the process of trying to get the levels right.

Has anyone else had this? I have another blood test on Friday.

Its so frustrating. Im a healthy person. I eat healthy and exercise. But when the levels are wrong, my weight is so bad!

Thanks