i use my nebulizers and oxygen every night. i wake up in the morning and have trouble breathing. could it be hat my cannula shifts during the night feeding only one nostril. some nights it falls completely out of my nose? after i take my nebulizers my breathing returns to normal. is there anything i can do to prevent this from happening? also sometimes my pulse on my oximeter shows oxygen level about90 or above but my pulse is very low, starting this morning it was 39 and slowly worked uo to 82! other days it's over 100 and doesn't go below 90. any ideas?