@celia16: Thanks for your questions. My O2 level fluctuates, depending on whether I'm active or sitting. If I move from one room to another, or change clothes or some similar activity, my oxygen drops to 70, my lips turn blue, and I get tired and have to rest. I only go out for doctor appointments anymore, because even the walk from the house to the car tires me. By the time I've gone through visiting the doctor, coming home and walking into the house, I'm exhausted. If I'm stationary and not doing much movement (like now) my O2 is at 98 - 100. Pulmonologists say my lungs are fine; I've been through a battery of different tests, but everything points to no issues with my lungs. I don't take breathing treatments - that's a great idea I will ask my doctor about. And yes, I've had SO many blood tests, it's surprising I have any left. I'm just so frustrated because no one can find a cause. My poor husband is doing 95% of inside work, plus maintaining the yard, running errands, getting groceries, etc. I used to keep my house spotless; now I see piles of dog hair (we have 3) and rugs that need cleaning. I expected my retirement years to be active and fun, but I'm stuck inside 90% of the time. I hate it.