This started about a year ago, and has continued now since I have joined the Track Team. Every time after I do a hard running workout in track, I get ear problems in my left ear only. It feels almost like when you are in an airplane and your ear pops. I can't hear as well on my left ear when this happens and it just feels weird, but then it goes away after about 15-20 minutes. It feels like my ear gets plugged. This happens every time i do a hard running workout. Does anyone know what it is, thanks.