Welcome to HCM.Palpitation
are not so a great a problem as to make you think whether you have to live any more. People with a 1000 times more serious problem than this do live comfortably by a strong will power and positive attitude.
You have to rule out if there is any organic cause for your condition and if none is found then you have to live with it.
You need to checkout if you have any cardiac problem or anemia
and if present that condition has to be treated. You are already being managed for your thyroid
What is more important is your WILL POWER AND POSITIVE ATTITUDE, which will work as magic to solve most of your daily life problems.
Wish you all the best.