Any Neuro otologist here? Treated soon?

I have pulsating tinnitus only when I lay down on my sides.I hear the pulsing heartbeat sounds in my both ears while laying down on respective sides.If I lay down on left side,I hear heartbeat pulsing vibration on left side.same on right side ear while laying down on right side.I have chronic jaw and neck pain for which I took MRI of jaw.MRI of TMJ shows right sigmoid bulb venous diverticulum. The jaw doctor who did order the MRI said he don't know what this is.My GP said the same. Is this something serious? What is the treatment for this. I don't hear it during the day while I stand or sit. Hear it only when I lay down on sides and it's like throbbing vibrating sounds. I have ear ringing since this jaw pain started. But this pulsating sounds started since last year. Chronic pain for 3 years in jaw/neck. Can I leave this diverticulum or should I get this treated? I am currently outside India and planning to travel in few months to India to check this. Is this need to be treated soon?