Thyroid

I have an appointment on the 21st to check out my thryroid and my doc told me to get my blood drawn a few days before the appointment so they could have it all ready. I decided to do it a whole week early just to be safe so I went on the 14th, the next day I get a call from the doc's office and the nurse told me they got the results and it showed that my thyroid is underactive, meaning I have Hypothyroidism (the one that makes you gain weight). So they put me on some medication to try and control it. When I had gone in the first time it was overactive (I was losing weight). Basically it is an experiment because when I go for my appointment on the 21st they are going to check it again to see how the medication is working and if it needs tweeking. So really it could be an up and down situation which doesn't sound fun.... :(