What is wrong with me? (Anger issues)?

I seem to have discovered i have an anger problem. I currently am dating a genuinely nice person who treats me better than anyone I've dated. However, we have gotten into a lot of fights in the past two months of us dating and I know I've caused them. he'll do something that annoys me, has a differing opinion that I can't stand or something like that and I'll completely flip on him to the point of him crying and me trying to run away and dump him. He usually holds me and gets me to stay and I'll calm down and realize how stupid it was. It's gotten to the point where he gets physically sick because of how much i emotionally abuse him and I hate it and don't know why I do it. I'm trying to stop be I'm so confused as to what it is or how to fix it.