[zapperdapper]

It sounds like quitting to take a less stressful (but probably less well paid) job would be a permanent solution to a temporary problem.

I would think seriously about taking some sick leave. Work a bit on your evening projects during the day. Get plenty of sleep and exercise in fresh air. Switch off the news and listen to classical music instead. Maybe this sounds lame but I did this when I was going through a rough patch and my mental health rebounded.

Good luck!