I was on a flight from Sofia to Bologna in mid-September of 2017. It was an early evening flight (can't remember what time we took off but it was already dark), and soon after takeoff, around the time we reached cruising altitude, something like turbulence started but it lasted throughout the rest of the flight, for over an hour straight.
The turbulence was pretty violent: people were throwing up and the captain announced they were going to lower the altitude (I remember it was significant but I don't remember how much exactly).
I remember it was very cold in the plane throughout the whole flight. It was also pitch dark: they turned off all the lights, except for blue lights in the lower part of the aisle. We were relieved to have landed eventually as it was one hell of a flight.
I fly this particular route very frequently and I've never experienced anything similar. Is it possible that it was just regular turbulence or was something wrong?
I'm not terrified of flying or anything, just super curious about that particular flight. It was a Wizzair flight, the plane was Airbus but I don't remember which model.