Hi mate, just mentioning that I'm having similar experiences with dreading supervisor meetings, not making progress for long periods of time, getting frustrated, questioning myself and my career choices, feeling my research is not good enough etc.
I hope you get through the tough times to reach a calmer, more peaceful place in life one day. I imagine it's about persistence and patience, especially being patient with yourself. Good luck my friend!
I also haven't figured it out yet.