Possible causes of r-sided headaches above forehead primarily at night after sleeping on back of head. hard time opening true r-eye. arms and legs get tingling. thinking a nerve issue but worried about brain tumor?

It is not feasible to provide a meaningful opinion without additional history, physical examination and may be some tests. It would be prudent to see a doctor. Wish you good health!

Could be secondary to these triggers: jaw (TMJ), dental issues, focal sinusitis, neck problems, focal thoracic outlet syndrome, migraine, occipital neuralgia. Due to your tumor concerns, get this checked out by your doctor.