Hey! Don't be scared, it's okay, so many people have tinnitus yet only 1 in every 10 (Americans) seek help for it. You should definitely see a medical specialist if you're able to-- especially if it's something that happened suddenly and abruptly. Good news is-- you aren't alone and people usually habituate!
I personally have never heard of tinnitus sounding like that, so to me that's very interesting. In the mean time can you put on a fan or something at night when you sleep? I am sure it will still be noticeable, but it definitely won't be as startling and noticeable as it typically is. (Think of a candle in a dark room. Only thing you notice. A candle outdoors-- isn't as noticeable anymore! Think of the tinnitus as that candle.)