How to earn a burnout

So I went and gave myself a burnout, because I don’t learn.
I’ve sent the next Why Odin Drinks story to my editor and decided to tackle the genre that I’ve always found the most difficult: romance. I’ve done a lot of reading first, both of craft books and various sorts of other authors’ romances, noting what I did or didn’t like. I settled on sweet (nothing sexual happens on the page) m/m (it didn’t work, gay men have too many cocks to spend the night cuddling without at least one’s interest getting aroused, so it’s sweet-with-heat now). I started writing the first draft and here’s where I made the same mistake I always make: I stopped watching what I was doing.
I can, as in I am able to, work approximately three hours a day. Unfortunately, tasks that for most people are either unnoticeable or, at worst, irritating chores constitute work for me. Folding the laundry; cleaning the bathroom; cooking something more complicated than an egg; taking a shower; often simply reading. Therapy, obviously. Unfortunately writing is also on that list.
It’s escapism, I love doing it, and it exhausts my energy without me noticing, because I don’t want to notice. If you love your work, it isn’t work anymore, we all know that. So I’ve spent two weeks drafting my romance, navigating the complications and changing the plot as I went, and accidentally completing NaNoWriMo (fifty thousand words – an average romance novel clocks at 60-80 thousand) within two weeks. I wrote every day, of course – “you’re only a real writer if you write every day!” Then, to nobody’s surprise but mine, I crashed. Badly.
…
The lead protagonist of my novel Storytellers, a blacksmith called Gunnar, suffers from depression, social anxiety, and possibly a form of PTSD. Today we would be able to steer him gently towards a medical professional of some sort – that is, if he managed to break through the internalised stigma of having to be a Strong Man Who Needs No Help Ever. But Gunnar was born in 1888, the novel takes place in 1920, and all he knows about his condition is that 1) it makes him “not normal” and 2) he can never, ever tell anybody about it.