When I eat I feel like vomiting, but when I lay down to rest I feel the same way. The only time I can sleep is at 3-5 am. Can somebody please tell me what to do about this, my mom refuses to take me to the doctor, and I have been feeling this way for about a week now.

How old are you?
You really need to see a doctor about this, it could be from many things, reflux, virus, stress, the list goes on.
Are you in school? Is there a school nurse that you could speak to?