Sounds like you might mean Fleeting Tinnitus? If that's the case, then it's a normal occurence, even if someone dosen't have T.
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Yes. As aot said, that's fleeting tinnitus. It can be very scary, because (for me at least) it tends to be much louder than the normal T. For a second everything goes dead silent, then ringing starts. For me it stays for 1-3 minutes, then my regular T creeps back.
Yep, and I get it fairly often and it's exactly like that. My head tinnitus plus my left ear goes 95% silent and a sinus tone starts in my right ear, which then slowly fades out in 10-15 seconds and then my normal T creeps back. I would prefer my fleeting T tone over my usual T :/