I admit this week was frustrating with the weather but today was frustrating for another reason. Yesterday I noticed that I was going a bit low again with my oxygen levels while I exercised. I am maxed out on my portable concentrator – it won’t go higher. So, I decided to run a test today with a tank & see what I need…the result is depressing a bit, I will admit. I did however, report these changes to my doctor because I know they will affect my score.