Went into a barometric chamber yesterday. we went up to FL250, then off oxygen until hypoxic. My ears cleared fine on the way up, however when descending, only my left ear equalized. My right ear was stuck at 25,000 while we were down at sea level. Needless to say, it was excruciating pain and felt like someone was hammering a nail through my head. The valzalva never worked for me, only swallowing does. Tried everything, it's starting to clear on its own. I have a feeling it might be tied to allergies but my worry is that its a problem with my ear. Should I experience a real life rapid decompression, I dont want to have to worry about trying to land a plane with such pain in my ear. Hopefully some of you guys can chime in. Thanks...