Hearing issue

I have been experiencing a systolic turbulence sound in my left ear before I am fully asleep. It sounds like a periodic subtle or mild rushing or whooshing pulsation along with a very faint heartbeat. I do not notice this when I am active and upright but only while waiting to fall asleep. Has anyone had these symptoms and/or been treated for it?

Several months ago, I had developed a fluid buildup in the same ear behind the eardrum which caused me to lose the hearing in that ear. It was due to an airborne allergy. I was advised by a nurse to take Sudafed and Afrin for three days. I did, it cleared up and my hearing was restored. No similar problem since until this the last few weeks.