Hello, you say this started after turning your neck? I would say it could be a misplaced vertebrae from turning your neck too far, I would see a chiropractor, they have helped my neck numerous times, also, a good massage can help these issues as well.
A lot depends on your age. The symptom suggest partial blockage due to atheroschlerotic deposits. An MRA/MRI is definitive. Is it serious? Hard to say.