I am on 100mcg of Levothyroxine and have been for some years now and doing relatively ok. Over the last couple of months or so I have been suffering with terrible anxiety all the time that I am awake and palpitations constant with the heart beat coming out my ears. It is becoming very distressing and caused 2 bad panic attacks which I was able to control as I suffered those many years ago when I was going through a difficult time. I went to my GP last week who was understanding and offered anti-depressants which I refused as I am not depressed!! Sleeping tablets were another option but I have no problem sleeping when I can get to sleep so again useless. My GP seemed to think it was psychological as my blood results were all good especially my last thyroid results he said which I had in January 2018. He said I could have another test as I might have gone overactive? which may be causing the current symptoms however at the end it was decided that I take a piriton at night as all antihistimines have a sedative action and that may help me relax!! Needless to say I have not done that either. I have been referred for a cardio-echogram. I previously had an ultrasound on my heart and results he said were all ok. Has anyone else had anxiety creep on them very suddenly with palpitations and is it connected to my Thyroid. I do have sub clinical cushings syndrome which is being conservatively managed for the time being as I dont have all the symptons required for an adrenalectomy (hope spelling correct). I am finding the anxiety and palpidations very distressing and annoying all day, even at work where I am now. I have also gained 11 pounds in the last couple of months going from 46k to 51k. I had a bi-femoral angioplasty 6 weeks ago and am still recovering but back to normal routine and work etc. This anxiety and palpitations however are new to me and I just dont know what to do with myself as I feel I am wired up like a coil spring. Sorry if this is long winded but any advice would be very welcome from the wonderful knowledgeable people on here.