What's wrong if I feel weak every time after I finish eating?

Sleepy all the time and havent really been eating.. whats going on?

• I haven't been able to get to sleep till 2-4 in the morning for some reason, But the thing is that i will get up at 7 or 8 and feel perfectly rested. But then later on in the day i will get really sleepy and then take little naps. Also whenever i make something to eat i feel sick to my stomach, and when i wake up in the morning my stomach feels hollow and it hurts so I will make something to eat and when i go to take a bit i have to spit it out cuz i feel like im gonna throw up. I have no clue whats going on its been like this for a little over a week. I don't feel sick like a cold or anything, I just feel a little weak. Oh and p.s i have been eating sandwiches here and there and also fruit when my stomach lets me

• Answer:

  The first part makes me think you might have bipolar disorder and beginning a manic episode, this is what happened to me before I was diagnosed. I slept very, very little. I was also never hungry but if I ate something I would be able to keep it down so I'm not sure about that part, except that when you stop eating sometimes you get soooo hungry that if you eat anything you get nauseous. You need to eat lightly for now and increase your food intake slowly to normal. Good luck!