I have been to two different cardio's, had all of the workups, echo, nuclear stress test, cat scan, MRI, ekg's, etc. I haven't had the sensation since I wrote this email but I will keep in mind what you said. What kind of doctor were you seeing, a PCP? How in the world can you go for 10 years and they not find anything if it was there all the time?
When i first started hearing heartbeats or the swooshing sound in the left side of my of my neck, I told my Dr about it, he couldn't or wouldn't tell me anything about this strange anomaly. 10 years later I had to have my aorta valve replaced. Get an appointment with a cardiologist as soon as possible. I was seeing dr on a regular basis and he didn't detect any problems with a murmur or leak. When discussed this after a cardiologist diagnosed my problem with my valve, he remembered. Your body is trying to tell you something.