Yes, this sounds all too familiar! Shopping was really difficult for me for a long time. There is just so much stimulation in the environment (lots of things to see, music, having to think and make decisions) that it really wears out the brain.

It sounds to me like you need to back off on your daily activities and really get some physical and brain rest. You might also want to talk to your doctor about headache preventive medications like amitriptyline.

Good luck!