Probably overtrain symptoms.
ADL almost isn't affected, but CL - grade 3 at least.
Positional Vertigo (or benign paroxysmal positional vertigo)?!
A sudden feeling that you are spinning, or that the room is spinning, is the main symptom. You may feel the vertigo when you first wake up. It may seem that any turn of your head brings on brief but intense spells of vertigo. It may happen when you tilt your head, look up or down, or roll over in bed.
As of today, Apr. 4, I don't feel any symptoms. Still, need a little bit more time for the full recovery.
I have no idea what was a real cause of my seakness.
Decrease in training volume, additional vitamins, good sleep - I hope those factor helped to recover.