How bad did I screw up?

[Humbucker]

So I'm cruising down the interstate today and a kid in late 90's corvette flies right up on my bumper. Being in 5th, I just slowly press the gas down and accellerate up to about 85. He does the same and doesn't go around. Since he's still on my tail, I decide to drop it in 4th and gun it and show him what I've got. So I did it.... Only, I dropped it into reverse somehow (??) when I dumped the clutch all I head was my rev limiter screaming at me. I pushed the clutch in and coasted for a few moments trying to figure what the heck went wrong.

The dude behind me goes around and heads down the road. I try to get the car into 5th with no luck. But 4th got me back home good enough.

The end result is I now can't get into 5th and reverse is like neutral. It goes into the reverse position easy enough, but nothing is there. All other gears work perfectly.

So this poses the previous question: How bad did I screw up? It is a Tremec 3550 tranny. Do I see a TKO 600 in the *very* near future?