Will I go back to normal when dysport wears off?

The short answer to your question is YES.Dysport, like Botox, is made up of an attenuated Botulism toxin which temporarily paralyzes muscles in the region it is injected into by inhibiting neuro transmitters from sending messages to muscles from nerve endings.  All that mumbo jumbo means it freezes specific muscles so they won't work.  From your description, it appears that forehead muscles were paralyzed allowing skin to drop, increasing the number of lower forehead wrinkles giving you as you stated "a mean face".  I am sorry you are going through this.  Normally, Dysport will work anywhere from 3-6 months, and therefore it may take that long for the wrinkles and/or the mean face to subside.  

Yes, this series of wrinkles will go away once the product wears off. This usually takes 3 to 4 months after the injection. Dysport and Botox are safe, but require an experienced injector to place the medication where it will do the most good and without side effects. Best, Dr. ALDO

Dysport will stay for 2-4 months but it should begin to resolve 4-6 weeks after treatment.  Best, Dr. Emer.