Pulsating/throbbing sensation in my throat for about a month...sometimes steady, not painful, but disconcerting. If anything it has become more regular of late. All tests show negative: chest x-ray, ekg, stress test, endoscopy. I do have sleep apnea, wear a mask, am in good physical shape, workout daily, and do not smoke or drink. I've had some stressful times of late. Your thoughts? Thank you.