This problem can be cured completely if you consult a physiotherapist at the right time(within 4-5 days of the problem). Electrical muscle stimulation and a few simple exercises are very much helpful in this case along with some medicine(Neogaba) to increase the nerve conduction.
Next Steps
Go to a physiotherapist.. Electrical muscle stimulation +some strengthening exercises.
Health Tips
At home.. Lie straight most of the time +do the strengthening exercises thrice a day+ do some facial massage thrice a day in upward direction.