Rough one m8, but happens to everyone. So easy to forget how silly variance is when you run good - when I'm running hot I like to remind myself of how dark the opposite effect of variance can be and how when you think it's bad, it has an uncanny ability to get even worse still. Last month me and my coach were playing the same games, I won 75 buyins and he won none and he's clearly much better than I am.
Actually yesterday I lost about 5k AUD ~11 buyins and did something you might find useful when you have horrible sessions. When I'm playing I tag every hand that I think is close, I'm unsure about, or is really interesting for some reason. After he day I go through and review all of these hands. I was expecting after losing 11BIs to find a whole bunch of horrendous punts/mistakes but of the 55 hands I tagged, only 3 were bad/clear mistakes, and none of them were horribly egregious either. 9 of the 55 were close/verging on the 'most likely bad' but not really clear cut mistakes, generally hands to inspect further Inna coaching session, and the remaining 43 hands were perfectly fine upon closer inspection.
So what I found was that even though I had a really tough session and felt pretty yucky afterwards, being able to see that it wasn't anywhere near as bad as it felt gave me all the closure I needed on the session.
I think the main thing is when you have big losing days, for me yesterday, it's important to make sure you get the most out of if. The way I see it is I invested $5k to learn/improve and quite often the big losing days are the ones you can learn the most from as you usually get to identify where new and exciting mistakes in your game are.
Just make sure you go through bad days with a fine tooth comb and really juice the most out of these periods because you will learn/improve waaay faster during these times than when you're sun running. The whole 'the key to success is massive failure' etc etc.
Anyway, GL turning this bih around, hope you book the W for June.