what happens when there is no more air to breath

see ive said numerous times that still, sometimes, i forget to breathe. yes, it has many meanings but i forgot the one other option..what happens when there is no more air to breath?! the effects will be quite the same..its just that i wont have the control anymore. its out of my hands. and no matter how much i want to breath, how much i miss it and long for it, how important that is or how much it means for me or the other..i wont be able to!!!

Sometimes i feel that the only thing still keeping me sane is the fear of one day finding myself being insane. 

oh God, where do i find air in those days.