After a night of heavy alcohol consumption, i have a mild sharp pain in my throat and upper chest when breathing in. what could this be?

Its hard to tell without more information. Here is a thought. You passed out and vomited a little, then aspirated some of what you vomited

Alcohol is a poison that never did anybody any good, ever, so stay away from it. Quit drinking while you are ahead. Have a healthy diet, exercise 30 minutes/day, drink plenty of water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. For nutrition: http://www.choosemyplate.gov/.