lately for about a week or two, ive been having symptoms of nausea after eating and usually at night....and it seems like i can never keep my food down after i eat...im not bullemic or anorexic or anything like that..and also i dont know but im been sleeping too much also...headaches...and i feel like i can barely stand on my feet...what could this be?? how could i possibly make it go away?

Could be the flu, could be a cold, could be pregnancy if you're sexually active, could be low blood sugar, could be an esophogeal hernia, could be.........well, alot of things.

If you're concerned then see your doctor. We can only guess.