I've had brain fog, complete exhaustion, blurred vision and balance issues for 3 years straight. Been diagnosed with cfs but feel its something more.?

Chronic fatigue. It may be chronic fatigue syndrome but if your symptoms are worsening i would see your primary care doctor and perhaps get a neurological consult. Neurological, rheumatological and many other conditions can cause similar symptoms.
Typical. These symptoms sound typical for cfs. Adrenal and immune support can be helpful.