I've had a headache and neck ache for over a month? could this be bacterial or viral meningitis?

Headache: Neither, its been too long to be either one. See your doctor about getting xrays of your cervical spine.

Meningitis: Headache, neck ache going on for more than a month is highly unlikely to be meningitis, which is generally is more acute/has a much more rapid course. YOur problem may be muscular, perhaps you have a cervical spine problem. If ongoing, get it checked. A short trial of an anti-inflammatory may be helpful, too.

Probably not: Bacterial meningitis moves much quicker and makes you very sick so it wouldn't be lingering around for a month. Viral meningitis causes headaches and neck pain but usually with fever and will resolve before 1 month. I would see your doctor for thorough exam and then consider seeing your chiropractor to help with the neck pain and headaches.