Breathing difficulties in a nonagenarian: a self report

This is a self report. It is age related because I am 96 years old; about 5 years ago I was asymptomatic in this respect. I describe the difficulties to think to have to take a breath without getting evidence of hypoxia such as flashes of light and other evidence of hypoxia such as loss of muscle tone. The problem I have is loss of autonomic function which normally controls breathing without the need to think to take a breath.