I have health issues for months now. Any ideas?

I have pain in my back, and my right side. I am constantly feeling nausea and tired. Other symptoms I have constantly are headaches (all over my head.. not just the right or left side) vision issues, memory loss, and loss of appetite. I can't move to fast or i get ill. It's been going on for about six months now. Does anybody have any idea what it could be? (I'll be going to the doctors soon, but not for awhile..)