I've had a lot of toxcity and heavy metal issues myself, which "wacked" my whole endocrine system out of balance. It sounds like you have a good handle on the chelation, so I won't repeat any of that advice here.
But I found that to help my body to detoxify and get the blood flowing and the energy going, I've had to start doing infra-red saunas. The sauna is really helping me detox, so fast that I've had to back down a little on them.
Its not cheap to buy one, buy maybe you could find a friend or someone else that has one and give it a try.
You may still have some toxins trapped in your thyroid that is throwing your whole system out of wack.