Wow. I would say, call your doctor now. Today. This instant! Seriously. This is not normal behavior.
Some things that might cause this are low/high blood sugars or swings, low or high blood pressure swings, reaction to pain meds/anesthesia. Even just having an absence of your coping tool (food).
It's normal to have mood swings and episodes of depression, especially after gut surgery. Just messing with the guts can disrupt neurohormones that affect mood. BUT, if you are having idiations of violent rage, you need to be evaluated and to potentially have a med on board.
Also, you may be seriously dehydrated. So I would immediately (if it was me--I'm not a professional), start invisioning peaceful scenes, taking super deep, slow breaths, and dumping water into my system as much as my surgery allows. And I would remove myself from the family and lay on cool, sheets with low light and lots of air moving. No loud noises or tv. Maybe low peaceful slow music...but only if it doesn't agitate or annoy.