You've gone through a LOT lately, it's no wonder you're feeling like you're on a rollercoaster!
I'm sorry for your loss. Even if our loved ones treated us poorly, it can still leave an emptiness when they are gone.
btw, teenagers can make their own meals

My feelings as a mom: it's not up to them to take care of US, but they are pretty capable of taking care of themselves.
Take good care, and use whatever supports you have to the fullest, including posting here.