Heavy Palpitations with Extreme Lethargy

I used to drink heavily in my college days some 1.5 years.I am 27 and experience extreme palpitations after having even small meals ,even water .these are visible all across my body. i cannot even eat small amounts of food i like eg chips,biscuit,fried items.alongwith this i don't have any energy to even talk ..i feel depressed ,unhappy,grumpy,light headed,feverish,unable to concentrate and talk properly,can get enough sleep even after 10-14 hours of sleep in a day,forgetfulness ,carelessness ,i feel like gasping for air after having meals,pressure on chest and of clothes on whole body. .i got a job just last year but i performed so bad that they are going to fire me .i am diagnosed with dyspepsia ,low vit b12, vit d,for which i have already taken necessary advised medicines for around 1.5 months but situation is still the same.