My forehead still feels frozen, face numb & other symptoms after Botox in November, when will this end?

I'm sorry to hear about your symptoms. They are very unusual. Did you report them to Allergan company, the makers of Botox? Did you ask them for their advice? They have a consumer line where you can call and report your symptoms. What did your injector say to you? There is no antidote for neuromodulators on the market but there are medications to treat Botulism. Botox affects the movement of the muscles and never their sensitivity so I cannot understand and explain the numbness sensation.I advise these symptoms to get reported to the company and for you to seek a neurologist evaluation for further work up of your numbness and rule out potential botulism.
Wishing you a speedy resolution.

Long term numbness or feelings of being frozen are not typical with Botox injections. The product results gradually fade over three to four months. If you are able to animate (raise your brows, make a frown expression, have crow's feet when you smile, etc) then the product effects are wearing off. I encourage you to return to your injector for an evaluation.

Your symptoms are not typical of anything related to Botox. See a neurologist to help determine your symptoms