OK, one more idea to add to this list of good ideas. Your description of being hot, panicky, and sweating describes me perfectly when my thyroid comes "on-line" and I warm up. I'm not used to my thyroid feeling stimulated, with its interplay with the adrenals. Your mention of it being connected to vitamin C made me think about Dr. Abraham saying vitamin C helps improve the cellular transport of iodine. Made me wonder if the iodine is now getting into your body better. Also, vitamin C supports adrenal function, which might respond erratically at first to an increase in dose. Pick and choose if anything applies. Best wishes!