I would definitely go seek professional medical advice on this, as there are really only two reasons your hearing would be deteriorating at the rate you seem to be facing
1. Some degenerative disease has attacked your hearing, and you should seek medical attention for that immediately.
2. You are listening to your music WAY too loud or exposing yourself to extremely loud volumes with absolutely no ear protection.
In both cases, you need to really pause and figure out what is going on, because it's going to be very hard to write music if you can't hear music. Not impossible, of course, but you should try to preserve as much hearing as you have left.