Hey,I'm really in a distress now

Hi and welcome to GoY... What are the conditions you kept your Dracaena since you took it home. There is also the possibility it was not properly card for when at Ikea! For info on how to go copy and paste the link below

http://www.guide-to-houseplants.com/corn-plant.html

If its only been 4 days,unless you left it outdoors in full sun, or in the car with heat and too much sunlight for a while, that's too soon for it to be something you've done - I'd take it back to IKEA

When I carried it to my home, I only put it in my car for around 20 minutes. Wehn I got home, I watered it and placed it around 5 feet away from the window. I really have no idea what caused this problem.

Did you have the air conditioning running when you put it in the car, and then drive straight home, or did you stop at another store for 20 minutes--quite long enough for the car's temperature to rise to 140º F, and cook the leaves? If so, it was probably evident when you brought it home, but probably only to the practiced eye. Later, the damage becomes obvious. as the cells turn to mush. We see it pretty often here in Phoenix, AZ.

This happens often. You see a beautiful,seemingly healthy, plant in a store. You bring it home and a few days later kerplunk. This plant is suffering from transport shock, not from store to home but from wholesaler to store. Looks like you have a good placement for this plant in your home. Just do a little surgery by snipping off the affected leaves right to the cane. This will make you feel better when you look at it. Keep the soil evenly moist with your favorite bottled water...not from the tap....and wait for it to recover. If you take it back to the store get your money back but don't exchange it for another plant, the same thing will happen.