Once you join, you'll discover you are not alone in continuing to have symptoms on synthroid. That's because, a lot of people (contrary to what endocrinologists believe) have difficulty in converting straight T4 meds like synthroid to the usable T3 form.
It's been a long road for me. I finally got on armour over a year ago and then had to address my adrenal fatigue. I'm still working on that. Then last summer, Forest Labs decided to reformulate armour and replace the dextrose with more cellulose. This caused a lot of people who were previously optimized a lot of problems. Those people switched to RLC's Nature-throid. When I had my scriipt renewed, I switched too. My body did not like the nature-throid. I gained about 15 pounds and developed weird symptoms like aches in my thighs. I then switched to Canada's Erfa Thyroid and I'm feeling better and I am SLOWLY loosing weight.
If you decide to switch to natural thyroid, please check out Janie's site: Stop the thyroid madness out. Please get your adrenals tested and ALL the labs she recommends. If you have low ferritin and adrenal fatigue, the thyroid hormones are not going to get where they need. You'll need to start at low dose and increase slowly until the adrenal fatigue is supported and the ferritin level is raised (if it's below 90).
I have learned a lot from Janie and Stephanie (owner of the Iodine board on yahoo).