Watching the video, it's amazing that no-one was seriously injured in that accident. The angels were looking after you indeed. And the Fiesta driver more so - the Merc's safety cell looks more or less uncompromised, the Fiesta... well, best not to think about that.
I came across stopped traffic on the Munich-Garmisch Autobahn once, was shocked when a skidding car managed to come to a stop between two lanes of traffic without hitting anything and more so when we came across an SL (the very sturdy 90s one) torn in half behind the passenger seats. Amazingly, the driver walked away from that one too.
Rest, recuperate and get well, and hope we still see you in December. Take care, Mark