That's possibly the sound of your Eustachian tube trying to drain. You been swimming recently? My ear has been popping for a week every-time I breath through the nose or move my jaw. I think this was due to a lot of pressure that had built up. Anyway its pretty much gone now. I've been drinking lots of herbal tea, sleeping on the right side so gravity takes its course and drunk 1 "lemsip" which goes against my rules of not taking paracetamol but it also includes a chemical which helps unblock nasal tubes, this could be related.
Do you suffer from Hyperacusis & T, or just T?
Also I have just noticed your profile pic.. You skate!?
Deep.