Obviously I'm not a doctor, but it could just be your middle ear muscles being sensitive from what you were doing. Doesn't necessarily mean damage has been done.
Hopefully the ENTs looked closely enough and were competent. You can always get another opinion, up to you.
Seriously go easy on yourself. Don't stress so much, because it's not good either. Some people have gotten tinnitus from stress, believe it or not. I put widely available over the counter earwax drops in my ears, felt it get stuck in my ear (behind the wax I guess), shook my head side to side, and freaked out a bit and that's what triggered mine.
Relax, wait and see. Many people get tinnitus and have it go away. It's way too early for you to jump to conclusions.