I bet when you got kicked in the head by the horse (!) It *rebooted* your olfactory. Check this video out:

https://www.youtube.com/watch?v=p04A4yocEPU

A family member sent this to me a few years back when I lost taste and smell from the rona. Doing the flick trick in this video I recovered both senses in short order.

Much less dramatic than your experience but I immediately thought of this when reading your intro here and imagine that the same underlying physiological *correction* occurred when you got kicked.