Not able to offer solutions but can offer quite a bit of sympathy! I have had pulsating noise in right ear for a few years now and saw Ent Dr. with no solutions. There is a web site I have found helpful in the past, Woosh. either com or org. not sure which. I never know when the pulsing will start or end. Trying to learn to ignore it. Not an easy feat.
Good Luck with you situation I hope you can find a way to end the problem.