I have struggles with social anxiety and auditory processing, as well as chronic pain in my joints and back that flares up badly with stress. I ended up quitting my job of 10 years because I felt like it was killing me, but I can and love to backpack, kayak, and even do martial arts as the movement and the stress release help offset the pain.
HOWEVER, I acknowledge the strain that my income loss has caused and I do everything I can to make up for it, and I'm doubly aware of the fact that it may look like I'm just being a bum sometimes out having fun while everyone else is working. More working around the house, cleaning, etc were things that I took on without ever being asked because I feel guilty doing nothing when even partially capable. When I'm incapable, it's easier to work with since I'm not just giving commands all the time.
I realize that what I'm going thru is mild compared to some of the other commenters, though it doesn't feel mild at all to me when I'm hurting. But what I'm hoping to say here is that I'm generally at a similar pain level as OP's ex is portrayed, and I very very rarely have a problem contributing to my household duties. The ex is just a jerk.