There are some excellent tips in this thread. Thank you everyone for sharing.
I also suffer from hypothyroidism since I was about 13 years old. Judging by the doses of the T4 that you're taking, I am guessing I'm a little bit on the more severe side since I've been at 150mcg of Synthroid daily...
Unfortunately every doctor I've ever visited regarding it has been very vague about what my blood work numbers come back as and every time I mention supplementing in T3, they basically shrug me off as if I was advocating some old wives tale remedy. Everything I've ever read about taking T3 has been beneficial, but none of my doctors have wanted to put any time into going over the information with me. Very frustrating.
One other tip that I could pass along to help, which was given to me very sternly from an endocrinologist of mine, is that you NEVER take Synthroid [or other T4 medication] with calcium. The two supplements should be taken as far apart as possible, since calcium blocks the absorption of the hormone. No scientific backing behind this, but thought I'd pass it on to anyone taking a multivitamin with their medication like I used to.