Welcome to HCM
We understand your concerns
Your problems seems to be more psychological. If there is any heart related problem, you can diagnose it with the help of EKG/ECG or stress test
. Doctors would recomment these tests if they are in doubt. As two doctors did not find the need to do the tests, then you are over blowing it.
Again if there is any chest problem, it should show when you are exercising, straining while work etc.Panting for breath, sweating, palpitation
, excuriating pain, radiation
through left hand are asociatted symptoms.
Just relax and quit smoking
. Wish you good future.