I second another reviewer - I also had "unusual" side effects after having Botox injections for "crow feet".
Overall, I had Botox done 6+ times. Every time after injections, I had a headache (it felt like somebody squeezing my head, and I am not a headache person) and slightly blurry vision. The last several times, besides the regular for me side effects, I had eye twitching, insomnia, restlessness, and anxiety for a 2-3 weeks - last time it was so bad that I stopped doing Botox (even though I absolutely love the cosmetic results).
Now, my lines are back but I would rather live with ugly wrinkles than go through this hell again, very disappointing.