My site is now USELLES. Gonna need to start fresh.

I installed this plugin to test some features and it didn’t had what I was looking for. After some tests, I tried to uninstall it, but now I can’t access any pages, can’t create any new posts, pages or categories. My site is now useless, I will need to reinstall it fresh from the beginning and will loose a week of work.
DON’T INSTALL IT because it doesn’t undo things if you need to remove it.