Is it helpful, how is it possible, to deal with anger by 'accepting' it with equanimity?

I'm new to Buddhism and I had just started to put some of the teachings into practice. But I'm having great difficulty dealing with my anger. I have always been rather intense in my emotions. I get angered quite easily. I've done some reading and I'm still stuck. I need some help on the way forward. From the readings I've done, I was told to practice forbearance, which is something I'm actually quite used to doing. But the things is, instead of expressing it, the anger is seething inside of me, and I would be passive aggressive, which is also wrong. From doing this, I would get a headache and waste a great portion of the day. Then, I've read that I should practice metta towards my anger, accepting it with equanimity. So, this morning when I was angry, I tried but failed. I would tell myself that being angry is normal, but the anger still remained in me for a long time. So, actually, I'm rather confused with this acceptance of anger. How does it help in any way? Thanks all.