Lately for about a week or two, I've 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 don't know but I'm 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, a lot of things.

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