RE: nutter bypass...
Dawnie, it sounds to me like you may have a couple of problems. "Bumpsteer" and "Death wobble". They sound worse than they are. You may have one or both contributing to your shimmy.
First off, do you have a lift?
"Death wobble" is usually caused by your front end being justified to one side, or "Toe in" alignment problems. ("Toe in", means just that, your tires are pointed inward)
The trackbar, If adjustable, can fix the first problem. The "Toe in" is usually the result of a) bad alignment, or b) lifting the vehicle, or c) both.
I don't recall if you have a lifted vehicle, if not, then it's doubtful your trackbar has anything to do with it.
Death wobble might also occur with age, when you bushings and bolts loosen or wear out, and you generally have a less sturdy front end.
"Bumpsteer" is the tendency of a vehicle to suddenly veer or swerve to one side when hitting a bump or dip in the road. The condition is caused by uneven toe changes that occur as a result of the steering linkage or rack not being parallel with the road surface. If you can feel a lot of reaction in your steering wheel when you hit small road bumps or holes then this maybe your problem.
So, here's what IMO it sounds like is happening:
You have bumpsteer, and when you hit a bump, it causes a chain reaction in which your bad alignment starts the wobble.
In my case, I had toe-in, and when I hit a bump, the tire lost enough contact with the pavement that when it landed it went inward (Because of the toe in). Then the other side, due to the shake, reacted equally, and bounced inward as well. After awhile, it builds momentum and the wobble gets worse.
To put it simply, get an alignment, and if that doesn't cure it, you may have bigger issues, but certainly curable ones. A good front end shop should be able to diagnose it if they are worth a crap.
Good Luck!!