When I am sitting and at rest my blood oxygen level is between 90-97 on level 2 of oxygen. The minute I move and get up to walk and do things I have to increase my oxygen intake from 2 up to 5 the highest on my oxygen gauge. I am still panting when I do this and my blood oxygen drops in the 70's. When I stop moving and just sit my level goes back up to 90-96. Does anyone else experience this. I might add I feel like my body is too heavy for me to carry.