Can someone please "Diagnose" me, I Think I have a Disease/Illness.?

You're right and your mom's right in saying it's in your head...but she's wrong in saying there's nothing wrong with you. What people fail to remember is the brain controls the rest of the body. So whatever stress the brain is under, the body will translate as physical symptoms--and yes, all of your symptoms are characteristic of extreme stress. You must convice your mom to go to a doctor. This kind of stress can lead to very serious health problems in the near future. So show your mom these responses and try to get her to realize that your health is in jeopardy!