Why is it his fault? The van was already committed before you came round the bend, and also he was courteous enough to raise his hand and say thank you as well, maybe the exception to the stereotypical white van man...lol, sorry but i feel you should have reversed..
Unfortunately if there's nobody in and the car is not causing an obstruction then they are legally entitled to do it, even though it's somewhat inconsiderate to the owner/occupier. Also, they may not know you need 24/7 access.
Was there a vehicle on your property?
Have you explained to them the situation regarding needing access?
Hope you get well soon mate. Don't let it get you down. All the best.
The lemon e36 m3 was a disgrace failed numerous tests and e46 is better