How do i get doctors to believe that i could have cfs? i am never taken seriously and am at my wits end. any advice will be great.

It's difficult: I don't think we know all there is to know about chronic fatigue. I would rule out all the usual endocrinology possibilities like diabetes, thyroid, etc. Then, look for fibromyalgia, lupus, sjogrens and autoimmune disorders, muscular problems, sleep related issues, heart problems, lyme disease. As you can see, the possibilites seem to be endless, so it is frustrating for patients and physicians.