Need a diamond stone for that problem
Ouch! That hurts. Sorry to hear about the blade getting dinged up. I know what that feels like! To fix it will require more than a Norton 4k8k and sandpaper. First, check to see if it's straight or not. It may have also gotten a bend or twist in it. Second, post a picture so I can see where it got dinged. I have bought razors with a chunk broken out of the toe end and just ground them back (I make knives so I have all of that machinery) and made a shorter razor. I've also very carefully tapped the blade back into alignment with a copper hammer on a precision flat surface and then reground.
A DMT Extra Fine 1200 continuous diamond stone will take small nicks and microchips out of an edge and then you move on to a 4000 and 8000 and then strop. Depending on how bad it is, it may take some time to fix.