Hey Kat, so sorry you are dealing with this. I had a ton of vision and dizziness problems when my hyper POTS kicked in. I stopped driving too. It was hard to explain, but it kind of felt like my brain couldn't visually process information like it used to. I have the ace2 deficiency form of hyper pots which has low blood volume. I found that the dizziness / visual issues resolved through increased sodium intake to increase blood volume to get more blood to my brain. I basically drink a few gatorades, propels, nuun tablets, or sodium chloride pills every day. I dont need to take nearly as much as those with the other form of pots do, but 4-5 propels in addition to my regular diet seems to be enough to keep me stable. It is somewhat counter intuitive because of the high blood pressure that accompanies hyper pots and I have found that I have to be careful not to take too much sodium because my blood pressure has spiked to scary levels when I was taking an extra 3 grams of sodium per day.
Mind if I ask what you have tried to manage this so far?