"I have had less than four weeks off sick in total over my entire career..."
Thanks 'Loyal Commentator', your post actually triggered a memory from the early days when I had a total w@nker of a boss, he was such an ar$e that after a couple of months I thought to myself I'm not putting up with this sh1t and handed my notice in. I guess I was lucky enough that at the time I had no dependants or financial obligations so didn't have to give much thought to it at all.
Were I in such a situation now it might be very different and I can imagine if the option to just leave was not there then life would quickly become an unbearable living hell...