Urgent. I am going back to see the endo tomorrow. Since my thyroxine dose was reduced last year I have felt worse and worse. Am now getting palpitations where I am constantly aware of my heart beat. I know this can be caused by anxiety too but feel if I say any of this the endo will say I am over medicated still. Does anyone know if these symptoms can also appear when thyroxine is too low? I didn't feel like this when my t4 was just out of the top range.