Apparently Michael has been seeing a cardiologist for several months. They can't find anything physically wrong, and so the doctor has recommended that Michael leave the practice of law altogether, because it seems to be entirely stress-related. I haven't heard a quit date yet, but that seems to be the gist of the conversation.
This is why I try to be relentlessly positive and upbeat about the job, especially on the bad days. This is why I take my full lunch hour and go home, whenever I can. This is why I refuse to stress out about my work when I'm at home, or to dwell on the mistakes I've made, beyond a reasonable decompression time. Otherwise, the stress could kill me. Literally.