hello.if your all investigations are normal there may be something you are worried which makes you feel the symptoms you are getting.other possibilities is your work stress
which you may be having or you may not be having adequate sleep which may produce similar kind of symptoms.
i also dont know what blood tests you have undergone because even conditions like anemia
, thyroid disorders (hyperthyroidism
) can cause same problems.
so if you have already been evaluated by a physician, try other things that can help you out like yoga, meditation
, changing to a healthy lifestyle and more relaxation after work.
if you still think something is wrong get re-evaluated.some medications and withdrawal from some medications also lead to increase in heart rate
(i dont know on what medications you have been)
hope i have helped you.