in ear & pain on biting relate
to a dental problem due to which you are having these episodes of pain.
Numbness & pulling of nerves can be due to changes in blood pressure.
At 8 months preganancy (3rd trimester) it is not advisable to take any pain killer or blood pressure medicines. You need to consult your gynaecologist
first & then a dentist
so that he can detect problem with your teeth.
Please DO NOT take any medications on your own, it can harm your baby
keep me posted