Having constant headaches, dizziness, nausea, eye pain for 3-4 weeks. Ct last week showed cerebellar tonsillar ectopia of 5mm. Pcm says no immediate action needed at this time. How long must I suffer?

See a neurologist. Your symptoms may or may not be related to the ct finding. A neurologist should be able to tell the difference.
Cereberellar ectopia. The key is the presence of symptoms. If present, then phase-contrast mr flow studies have a role in determining whether symptomatic chairi malformation patients may benefit from surgical intervention. You might wanna discuss with your pcp again or see a neurosurgeon.