I was delighted when my weight went down to normal when I went onto Levothyroxine, it was great to be slim again. now to my frustration, I find that Iv`e regained the weight that I lost, despite exercising, & not eating that much. My last blood test shows that I`m on the right dose of thyroxine, so what has caused the weight to go back on again. I hate myself because I look & feel so fat. Should I just take extra thyroid tablets to speed up my metabolism, or would that be dangerous? I`m willing to do anything to be slim again!