This is not an uncommon occurence after a weekend of heavy drinking. Alcohol CAN cause withdrawals as many people have already stated, but unless you are a chronic drinker, a couple of days of binging is highly unlikely to lead to withdrawal or DTs.
However, alcohol CAN precipitate an abnormal rhythm called ATRIAL FIBRILLATION
that can cause your heart to go fast for periods of time, and this can start and stop intermittently. This is so common it has a name - the "holiday heart" syndrome. (http://www.emedicine.com/med/topic1024.htm)
As Dr. Frank mentined, heavy alcohol can also cause cardiomyopathy
(poor heart function), but your fast heart beats suggest atrial fibrillation is more likely to be the cause. You should avoid stimulants like caffeine or nicotine
in the meantime (certainly avoid any more alcohol) and go to the urgent care or emergency room right now if your symptoms persist. They can do an EKG to verify the diagnosis.
Good luck! Hope that helps! Next time, take it easy with the alcohol.