Colon cancer ?

Im 35 years of age i have CFS and have been going to a Infectious Disease Specialist in Boston's Mass General for 10 years now .
Although i havn't been there in almost a year ..

And am now having symtoms (symptoms) again and worse ..
Nausea , Abdominal pain and discomfort , Lympnodes , Weight loss 16 lbs in a month or so , Thin ribbon stool for a month or so , Chest tightness almost tickels all over chest area . Achne (acne) like rash on forhead and temples .

Im due for a doctor apointment with My specialist Aug 6th ..

But i wanted to get some ideas on tests she should run ...