Postural Orthostatic Tachycardia Syndrome (POTS) is a poorly understood malfunction of the autonomic nervous system that can affect many systems and organs in the body. Common symptoms include blurred vision, racing heartbeat, light sensitivity, shakiness, fatigue, and brain fog. Sometimes these symptoms can be managed well enough to allow people to continue to work, but many people are so debilitated that Social Security disability is the only answer.
In this article from Chicago Health, Amanda Ritchie tells her story of living with POTS. A good introduction to a challenging diagnosis.