curled leaves at end and big yellow spots on some leaves

my plants were ok until i found spider mites and bought a spider mite spray from b+q (as it was last sunday grow shop wasnt open) sprayd em and now a hell a lot of leaves have curled at end and gone crispy some of the leaves have a crispy feeling to em and some have yellow spots on them.....does this mean my plants have had it???? please help

maybe you over did it with the spray, to intense? i spray with lights on no prob

got pics?................