Feeling light headed after a bout of heavy drinking is common and occurs due to withdrawal of alcohol from the body. You can expect it to go away within a week or so. Take lots of water and a balanced diet rich in vitamins
. Also try to ensure that you keep regular hours for the next few days. If, however, you do not see an improvement over the next couple of days, then please consult your doctor as in that case, it is unlikely to be alcohol-related.