I can't get out of the void and theres no land at the world border! and my game just broke...

I ran the command /teleport 5000000000000000 ~ ~ and was brought past the world border, when exiting, I was surprised to see no land. I stopped flying, and ending going into -3000 and cant run any commands or even talk in chat. I exited the game to see what would happen upon rejoining, and im stuck at the saving world screen. DONT DO THIS!!! I CANT JOIN BACK INTO SINGLE PLAYER!!!