My Calva says me command 'calva.reconnect' not found on every command. I reinstalled it 3 times, but nothing changed. Whet it did not find tests in test namespace, it was bad, but I lived with that. But now it not working at all. What should I do? I am very afraid to return back to terrible emacs and IDEA/Atom...

That sounds horrible, @ivana. What version of Calva are you using? Please visit #calva-dev. Right now I will be offline, but there are hopefully others there that can help you.

1.3.64 in right up corner in extensions list

thanks, i will go to #calva-dev