1. Yeah I had something like this. I had really intermittent tinnitus which appeared then completely resolved, then fluctuated for quite awhile. The type changed a lot as well - started high frequency, then low frequency, then pulsatile. Now, it's 24/7
2. Yes. I also have this. The fluttering / thumping is familiar with me. Internal ear air pressure changes definitely cause interesting symptoms - in my case, gaze disturbances / a little disequilibrium.
3. I'm not sure what this means, sorry