Such good advice. Learning what your triggers are and getting to understand yourself is such a huge step in getting this type of behavior under control. It seems you are already on the path as you have tried to take different approaches to avoid hurting yourself. That's good! You are recognizing that you do not want to hurt yourself.

There is a way to avoid this and it is to find that moment right before you are about to lose your cool, kinda like the 11th hour so to speak and STOP. in that moment and ask yourself "how do i respond to this feeling of ____" (anger, sadness). You can't help feeling angry or sad but sometimes you can control how you respond to it. Its hard, for sure, and I guarantee there will be times when it doesn't work but if you really try to identify that moment, you may be able to control this way.

Are you in therapy at all? There are some very effective techniques to learn how to calm yourself. Sometimes just paying attention to your breathing will help. Don't change your breathing, just decide to focus on it and only it when you start to feel that anger troll sneaking up on you.
Close your eyes, listen to the breath as it comes in and as it goes out. Think about how it makes your chest rise and fall. I sometimes count as it goes in and out- it helps me focus on breathing and not the sound of traffic, my noisy child, etc.

Good Luck!