Collocations for breathing - noun

deep, shallow
controlled, even, regular, rhythmic, steady
irregular, laboured/labored, ragged, uneven
His breathing was uneven, and he could hardly speak.

quick, rapid
slow
heavy
She picked up the phone and heard sounds of heavy breathing.

control, regulate

quicken, slow, slow down

apparatus
difficulties, problems
exercise
Try breathing exercises to calm your nerves.