Hi, MR1,
I'm so sorry that you're having to deal with pulsatile tinnitus after an MRI. It's very strange that it could have been triggered by the MRI, but I definitely believe it is possible. Perhaps your ear was already sensitive in some way before you had the procedure, and this was enough to set it off.
In my case, pulsatile tinnitus started after I took, then got off of, a blood pressure drug. I already had regular tinnitus in the affected ear, and I think that something about the changes that took place in my body were enough to trigger it.
I tried a lot of the same types of doctors and practitioners that you mentioned, and no one was able to help me, or to find a cause. However, the good news is that, over time, mine has calmed down somewhat, so that it is easier to live with. I've found that it helps to follow a good diet, exercise, and keep your blood pressure on an even keel. That keeps the pulsating calmer. I've also found that when I am able to get a good night's sleep, the pulsating is calmer the next morning.
Good luck, and I hope yours begins to calm down, too. We're here for you, and if I can be of further support, please let me know.
Very best wishes,
Karen