JetPack Locked me out of dashboard

Activating jetpack locked me out of admin dashboard + ruined the website background colors and images.
After deleting the plugin through FTP client I still have problems with all my backgrounds.
The information in “Theme Options” tab just reverted to default and it wont change, this is getting really frustrating … almost every plugin I install fucks up things, and these plugins were actually recommended.

Is there a solution to this? or do I have to remake the entire webpress?