Breathless .is it Asthma or mets?

Went into the city centre today for an opticians appiintment but was informed it was las week when I was in hospital so I will have to phone them for a new appointment. I hae been very breathless today,don't know whether it's my asthma or mets in my lungs. I haven't been toldif there are. Feeling very scared of dying. i WANT TO GET CLOSER TO God before I die Wanted to go to Mass yesterday but couldn't get there so I watched a live Mass on the net and I woke up in the morning with no pain at all!