I haven't been able to fly at all the last several months. Small changes in altitude of a few thousand feet made me very sick.
I felt like I might die after getting off an overseas flight of about 6 hours. Pulse ox was very low by the time we deplaned.
I live on an island in the Pacific and I am not the only one with this. Medical care specialists now come to us one day a week because LC patients often have this problem and can't fly safely.
This has improved for me. I always have a pulse oximeter with me and am requesting disability status for flying.
Please be careful. I wish you the best.