Driving with dysautonomia

I'm fairly new to dysautonomia and have been diagnosed with pots. Today was the first time in 2 years that I drove. I was having a "good" day so I decided to try driving. At first I felt a little nauseous but was still functional. I drove down the street then all of a sudden I felt this weird "head rush" and started feeling like I was out of my body. All these alarm bells were going off telling me I needed to stop or else I would have passed out. I was wondering if anyone has experienced similar symptoms because I don't know what this is.