I had this too, last year - a whooshing, pulsing sensation and then a really annoying fast ticking, in one ear. It wasn’t linked with heartbeat/pulse. It was more noticeable at night (maddening!) and came and went over a few weeks before stopping completely. I honestly don’t know if it was one of several low-oestrogen symptoms I was getting, or due to jaw tension, or just a random thing. But it does pass.