How to cure extreme irritability and fatigue after quitting multiple stimulants at the same time?

For various reasons I had to quit smoking, quit coffee, quit cocoa (formerly a nightly thing w/ a shot of whiskey) and quit most carbohydrates (ketogenic diet) to control heart arrythmias. The first two I quit at once 3 weeks ago. The last two just a week ago. Now, despite having fewer arrythmias, I am EXTREMELY irritable and tired and have been so since I quit smoking and coffee, 3 weeks ago, but no end in sight despite what I've read that it will go away within a couple of weeks. I would like to know how to cure my irritiability, for my family's sake, without drugs. There is no possibility of going back to any of the stimulants and quitting them more slowly/individually due to my heart arrythmia (triggered by all of them). Most of the time I just want to sleep, and if I'm interrupted sleeping or doing anything, I snap. I can't raise two kids this way! Anyone else gone through anything similar?