Some questions concerning Valsalva Maneuver

When I do a Valsalva maneuver (a way of clearing your ears by closing your mouth, hold your nose with one hand and blowing so that pressure is forced to the ears) and forcibly pressurize my left inner ear, I notice that my high frequency hearing improves to a very noticable degree. I can immediately localize sounds better, and make out amazing detail in crashing waves or music. However, as soon as I swallow or the pressure equalizes on its own, the detail goes away just as fast. If I valsalva again, it comes back, only to go away the next time I swallow. The difference is night and day, consistent, and the same in both ears.

I find myself constantly popping my ears when I am making and mixing music to hear better. But as soon as I let go and the pressure goes back to normal, the detail dissapears immediately. It is pretty frustrating.

Anyone have this happen? If I had high-frequency noise related hearing damage, wouldnt this be permanent and unchanging with eardrum position? How can I get my hearing to stay at the improved state as when my eardrums are pushed out a little bit?

Given these facts above, I do Valsalva pretty regurarly (few times a day) Would it be dangerous if I do it too much? If so, what are the risks?

Thanks!