Hi there,
I posted on here last fall because I had been diagnosed with Hypothyroid about ~18 months ago. My doctor at first told me my thyroid was barely producing anything...THS was 23. He put me on Levothyroxine (I think the first dosage was a little high, maybe 125). I definetly felt a difference after a month or two, not dragging around and feeling like I wanted to sleep all the time.
But, I noticed that I always had an upset stomach. I like breakfast in the morning...but I was not able to tolerate any food for at least ~4 hours after I took the Levothyroxine. I lost about 25 pounds last year. My job was so hectic also that just didn't have time to stop and think about things. Finally, this past November 2011 I went back in and told him about the weight loss, upset stomach, etc. They checked my levels, which were fine, and told me that Levothryoxine is a generic, and they tend to have "fillers" in them that can cause more side affects such as stomach upset. He switched me to Syntheroid and I have been much better.
Also, though I switched to taking the pills at night before I go to bed so that my body has a good ~8 hours to process the pill before I eat anything. This I did on my own, and I think it helped a great deal. At first I thought it might keep me awake at night, but it has not had that affect at all.
Hope this helps others!