OP hails from Atlanta, which I know can be a pretty humid place. So if the axle hasn't had maintenance for 9 years, well.... that's prolly bad.
Nothing to add to this thread others haven't pointed out. If you really can't rotate the axle in place via the ride-side hex-head (with wheel weight off the the axle), that indicates things are pretty grim in there.
At that point... get someone on the ride side of the bike to make sure it doesn't go anywhere, take your 5lb sledge hammer, and a good chunk of soft wood 2x4, remove left-side axle altogether, and wail on the axle end with the soft-wood in place. Take a number of manly swings, but ENSURE you are striking the wood that is directly over the axle. If you find that you simply dig deep holes in the wood... well, that's bad, best to hold up and re-group.
My 2 cents.