Right now we're facing waves of tsunamis from Google algorithm changes.
A ship's particular position at a sea will get sweep off, if not, catch the wave which propels it deeper into different position the captain wants to - it can be towards the shore, or deeper into the sea - favourable or unfavourable direction.
Since last month, there have been rough waves but some ships don't feel it. But these past 4 days, the waves are of tremendous impact that every ship got affected by it. I won't be surprise if these waves last for another few more days.
Right now, it is pointless to try to pin-point your location as the waves aren't finish yet. Let the tide/waves calm down first, only then you start to figure out what happened and what position you're at.
Like someone mentioned previously: it could be Google's algorithm re-analysing every website's value, thus your site will definitely be jumping all over the place.
So just have a cup of tea and let it ride it off. No point panicking and trying to figure it out. Just take a break and come back when the 'weather' and 'sea' calms.
P.S: I'm learning Russian and reading a good book on Emotional Intelligence. So yeah, you guys should take a break for now... perhaps a week or so. Don't stress about it.