wp-3.6

Not at all happy my site has been highjacked by 3.6 my dasboard will not respond can’t use my widgets very upset. Is it possible to go backwards to 5.5.2 ? Stuck in the mud and very upset you guys blew this you have a good product so I guesse you get board so you have to screw it up so that you have something to do to fix it.
Need some help here wordpress 3.6 hostage.
can be reached at [email redacted – we do not provide email support]
please help I have 25 sites help hostage.