Apologies, never heard about / had any experiences like your describing with the game. To my understanding its meant to be a sandbox/MMO where content is added throughout its lifespan and new things to do which is why it doesn't have a set end-goal and generally people make the goals up themselves and feel they've accomplished them on their own time. I'd say if you feel your done with the game, then you've reached the goal for you.
If you've not loaded the game, connected to the website or, anything beyond the forums here, may be something else causing the issues. Sadly, no idea you'd know best your situation of course. If such sounds, feelings or sensations are happening even when your computer is off, may want to seek medical assistance, or get a second opinion from a friend or family member on the problem. Not sure anyone on the forums here will be able to help much from the sound of it, can't see / hear what's happening on your end.