Welcome to HCM
You are taking alcohol for last 20 years it is long time, Palpitation
occured many years back are you taking Trika
regularly this is bezodizepine anti axiety drug and causes dependence so it should be discontinued.Palpitation go for cardiac check up with ECG and Holter Monitoring, to find any cardiac abnormality.
You should undertake a medical check up to see that every thing is fine if not yet done and at least alcohol should be used in moderation or if possible to quit.
It all depend on your age as you have not mentioned age, Routine CBC,FBS,PPBS,Liver
Function Test includung GGT,Lipid Profile
of Abdomen,TMT etc may be done.
If you smoke also it should be discontinued,
If you are over weight try to reduce weight.
Good luck to you