i know your not meant to wear your straps tight, and i know that the air pressure creates the seal, so why  is the bridge of my nose that sore that it wakes me up? i thought it was my first ff mask that was too big (medium) so they gave me a small one, that didnt work so they gave me a nasal gel mask, still sore and can ayone tell me how to stop getting sores on the bridge of my nose? help (i live in Scotland and you only get one choice of ff mask or nasal mask...