Thanks for the questions
Before I respond to your question let me tell you that Bell's palsy is one of the causes of facial palsy
. Other causes of facial palsy could be related to brain infection/tumor
etc. If some has these problems headache could be there along with facial palsy. Secondly your headache and facial palsy may not be related. You may consult a local neurologist
and get re-evaluated. A physical examination will clarify the picture better.
Hope this helps