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medication or thyroxin when ever taken may cause increase in heart beat, sweating, tremors, increased venous pulsations or in neck veins. Long term use may cause weight loss
. Thyroxin 37.5 is not a very high dose but consult your doctor for necessary dose reductions as any amount of excess thyroxin may cause these symptoms like anxiety
. And also get your thyroid function checked.
Hope I cleared your doubt.