hi and welcome
well with young age , hx of alcohol in past and fast heart rates. one should ideally do thyroid function tests
to rule out hyperthyroidism
. skipped beats like atrial premature contractions APC are some times normal phenomena in the young. what did your ECG revealed, really important and did you go for 24 to 48 hours of holters monitoring that can show any abnormal rhythm detected.
more importantly a cardiologist him self should look for any structural heart disease
by doing an ECHOCARDIOGRAPHY
. but remember its operation dependant and once clear with persistent symptoms not necessarily rule out any problem.. repeat once after discussing it with the cardiologist .
putting on beta blockers like metoprolol is mandatory for refractory symptoms. where it controls menifestations of fast heart rate , it may cause decreased but reversible sexual dysfunction
keeping in view of all this you must do TFTS for thyroid, and another ECHO and holters if not previously done . take care