Year ago I had bells palsy on right side & recovered 90%, since that time I’ve acute head pain behind the right ear, especially when stressed, what 2 d?

Why 90% You are experiencing tension and stress which has nothing to do with your Bell's palsy . Try to relax,ask your doctor for some medication like Ativan (lorazepam) 0.5 mg to be taking around your bed time, because it could make you sleepy, apply heat around the area behind your ear and your neck. You are young lady ,and you live in the best place on earth.relax.pray,and take the medicine bilshifaa inshallah.