Hello @januaryjane, I'm more sensitive to the sun when I'm driving in my car also. Here is a Mayo Clinic Newsfeed article on Sunscreen Season that you find helpful: https://connect.mayoclinic.org/page/cancer-education-center/newsfeed-post/sunscreen-season/ -- In the comments, @merpreb mentioned a new sunscreen from Europe that can now be purchased in the US. It's called, Tinosorb. She may be able to offer some suggestions.

You may also be interested in another discussion on Connect - Erythromelalgia: https://connect.mayoclinic.org/discussion/erythromelalgia/

Here are some links that may be helpful:

Sun Exposure While Driving: https://skincancer.net/clinical/sun-exposure-driving/
Your car’s side windows aren’t protecting you from UV rays, study warns: https://globalnews.ca/news/2706445/your-cars-side-windows-arent-protecting-you-from-uv-rays-study-warns/
Can You Get Sunburned Through a Car Window ?: https://uvaction.com/blogs/sun-protective-clothing/can-you-get-sunburned-through-a-car-window