Bending over reduces the lungs and often causes you to be sob. You can't breathe as well bent over, never could, but before you had more lung capacity.
As related to our COPD, exertion of energy causes most of our shortness of breath. Bending over is exertion beyond sitting for example. Shortness of breath after bending over can also be attributed to blood pressure, or heart issues.
I have a long enough hose on my oxygen tank that I can take the hose into the shower with me. Without the oxygen,I wouldn't be able to breathe thru the whole shower. It helps alot.
My oxygen drops in the 70,s in the shower as well. Try taking a col orjust warm shower. Not hot that helps. I have my oxygen right out the door and use it sometimes during the shower dand finetly the mi Ute I set my foot out the shower. I k ow some people take there oxygen right in the shower