Have you gotten any answers? I have been on Levothryroxine or years and from the first time I went on it I notices excessive sweating with exercise or in even moderate heat/sun, and possibly in high stress situations. My doctor switched me to brand name Synthroid to see if that would make a difference, but it didn't. Now we are discussing switching to Tirosint to see if that helps. This is not does dependent because at times my dosage was too low and needed to be increased -- the profuse sweating was sill a problem even when my dosage was too low.