@Starcrossed
Based on what you've described as your current body state, I'd tread very cautiously with introducing thyroid hormone. Used without sufficient nutrient stores or with unacknowledged body chemistry dynamics (eg over/under methylation etc etc), it has the potential to aggravate things.
There are various alternative approaches to boosting thyroid function that can be attempted.
The most basic is ensuring a strong nutritional (not just vitamins & minerals, also protein, carbs) foundation, key because everything relies on this. Taking T3 with insufficient nutrition will most likely aggravate the overall situation.
You can read more about this on the old RP forum, using this google search. (try different keywords)
site:raypeatforum.com boost thyroid function