Most places that do alignments just take your money. They have no respect. I have never had a allignment go good. I do it myself now. Rant over. Do you have a jack? Try jacking up the front of your car and checking a few things. Check for play in your tie rods on your steering. Inspect the ball joints and a-arm pivots (shake the wheel while jacked up) there should be no play. Turn the wheels from lock to lock with weight on the suspension (jack on the a-arm) and with none (jack on the frame). Your looking for anything that doesn't look right on the struts or all above components. I've had multiple failures over the years that the alignment people have missed. The worst was 2" of play on a steering bushing off of the rack and pinion steering out to the tie rod end. When they drove it onto the lift the tire friction would force the joint to one side and they would align the steering then test drive it. Took three tries to get it done. Same thing was happening. They said it was good and I drove it home. The next day it was pulling again. The tire would "wander" at speed causing the car to pull. Fixed the part and aligned it my self good to go. Rant 2 over. Castor and camber are a little harder to adjust but with the right tools you don't need a mechanic.

I have tried to switch the tires but its still the same. i suspect the steering rack might have been affected when i hit the curb. I am also concerned about how to find out exactly what is wrong since it might come down to a trial and error situation. Please advise.

Take it to Sears they will do a free front end inspection.