(urgent) Lost system after update. Again!

I just did full system update including kernel, and after reboot the system boots up only to command line because of course there are no modules anymore. No sound, graphics, network, no nothing.
To add fun to it, I am at work and have still lots of work do to in this machine which is now unusable.
I want to know how to reverse kernel update (if this would help) without internet connection
AND/OR
How to (Re)compile(?) all modules for current kernel which pacman apparently did not see necessary.

Ok, it happened again, but this time I was watching.
So, what is happening is that during system update run with
terminal -e "yaourt -Syua"
(I am running it from a dock launcher)
mkinitcpio fails with error saying "mkinitcpio does not exist"
However, if after the system upgrade I run "pacman -S linux" all goes well and good.

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