Hi Killerhertz
Sad to hear about the incident, THANK GOODNESS no one was on the footpath when this happened. None of us are perfect and I suppose we could all say there but for the grace of you know who.
The most important thing for all of us is to learn from it. Okay that wall has been demolished several times, but if the road was excessively slippery then on that day, at that time there would have been literally piles of cars slamming into your poor vehicle. Just look at racing when oil gets dumped onto the track, cars go off like there is no tomorrow?
If you were not speeding, then do you have low profile tyres? We all no doubt like these wheels but in adverse conditions they will not do you, or anyone else any favours. If you do not have low profiles, then there must be a reason why!!!
Shock is not very nice at all..... Talk about this incident, talk about this incident and above all talk about it

and laugh it off. Most important, laugh it off, you were hurt, no one else was hurt apart from the wall, that is clearly deceased, and unfortunately your car, may or may not join it.
Life goes on and there is another car, and perhaps another wall??

just waiting for you to come along. I was going to begin my post by saying 'Hi Killer-wall' (but the humour might have been lost before I explained about trying to laugh this incident off) It is an event which must be taken seriously, but shock needs to be flushed out of your system.
Take care and good luck,
John