fast

Assalamu Alaikum I suffer from asthma and at times need to use the asthma pump/inhaler. I would like to know if it is permissible for me to do so while fasting. will the use of the pump nullify my fast? If so then what should be done in case of an emergency?

السلام عليكم ورحمة الله وبركاته Is it permissable to keep the Qadha Fasts in the month of Shawwaal within the 6 fasts of Shawwaal? شكراً و احسن الجزء