50 Years Old, Getting Angry Very Quickly And Often. How To Control It ?

Hi, I am 50 years old, I am carer for my 77 year old mum, and have 2 children who are 15 and 20. I am an only child and do everything for my mum, she mainly gets up to go to the toilet, and to go to doctor s appointments. My step-dad used to help a lot, but now he has cancer , and can t help, since getting cancer, he seems distant and won t talk much to me on the phone, I don t know why and it hurts me. But my main problem is that I get very very very angry with my mum, but I don t show my mum this, I love her, but her habits annoy me very much, and they make me very angry, I don t know why, I feel very confused, I am like a Jekkyl and Hyde character, as soon as she annoys me, I have to block it out like leave the room, etc. otherwise I start to feel a kind of rage building up. Please help me.