Letting go of anger

I’m not an angry person, I’ve never been an angry person. About a year ago, I went through some bad illness and then a few months later an ex boyfriend broke into my home. I realized that since then, I’ve just been so angry at the world and myself, and everything to be completely honest. I don’t know why, but the must mundane things set me off. I’ve become apathetic to rules, to the small things my friends complain about, to everything. I haven’t become a mean person, but the feelings are there and I hate them. I journal so much, I meditate and all of that stuff. I thought I was working through it, but I think I’m still just feeling really angry at everything in the world and I want to feel better.
How do I actually let go of my anger?