There's a script that runs every night (UTC) that should revert all those downvotes.
There will be no other consequences for you.

The user who serially downvoted you, however, might get a friendly reminder from us not to do it again.

(Then again, this is your Stack Overflow account, not your Super User one, so you'd have to have a Stack Overflow mod check it out… not sure why you posted this on SU in the first place. Your question should have been posted on [Meta Stack Overflow](https://meta.stackoverflow.com/), just so you know for the future.)