Very heavy turbulences in a A380 

I was on a flight from Los Angeles to London a few days before Christmas 2016. The plane was a A380, operated by British Airways. I was sitting on the upper deck, last row. Less than 1 hour after take off we flew through very heavy turbulences. I never thought a A380 could shake that heavily. It was by far the heaviest turbulences I have experienced. I started recording after 5 minutes, because I found this very unusual. In the video you hear a few people shouting after a sick bag. I stopped recording after 4 more minutes because I thought its over. But then suddenly it got even worse, things flew from the service carriage and you nearly got lifted of the seat a few times. Over all it lasted around 15 minutes.