Periodic stabbing pain in right side of head when rightening from bending down lasts only a few seconds but leaves ache on right side and behind eye?

Positional headache. Headaches with a positional component it is always a red flag and need to be evaluated to exclude a lesion in the posterior fossa or a condition with low CSF pressure. Rec.: see an orofacial pain or headache specialist for further investigation and management.