Get an old dry bone, run it over a file to generate a small pile of bone dust. Add a drop of super glue to the pile, mix with a toothpick. Take a bit of the mixture and put it in the E string nut slot. Wipe of any excess. Let dry. File new groove. That will get your height back up.
You might want to check that fret #2 isn't too high. Either sight down the neck from the tuners to see or fret the E at the first and 4th frets and see if #2 is touching the string.
"No Tele For you." - The Tele Nazi
Ha! Tele-ish now inbound.