wow ive got exactly the same thing in my left ear !!... it just kinda pops and is kinda like when you go thro a tunnel and sends one side of my head bit num ... it sends me nuts... about 3 months ago i got tinitus which dont help me either ive finally started using my ear plugs which give me a 15 db drop...but there useless to mix with for me as i need stuff to be 100% clear and loud... and so finally i have found a company that do all the major music people and racing car inear plug headphones... gunna set me back £500 but the moulded to my ears and cut out all outside sound and just send me the signal from the mixer...this means im gunna have to learn to mix just thro the mixer with the cue crossed over with the master but at least it means i control all sound going in my ears... does anyone else mix like this as its been driving me mad the damage ive done to my ears and i see this as on option ..unless anyone else has any advise ?