Didn't he just see S5 yesterday? Isn't it still fairly early where you are? Isn't he b*ts*hit crazy???
YES to all the above
Don't call; don't feed the beast; don't let him draw you back in right now... you are enforcing very basic boundaries now...nothing crazy at all.
When S5 wakes up, let him try calling his dad. If he reaches him, fine; if not, he'll see him in a few days or can do as Jen has said...take some of his precious OW time to call him...