Yes, anger is infact a healthy emotion which if shut away can lead to depression! So, you need to find good ways to let it all out, preferably not at grandma. Pillows are good for... Punching! Shout in the middle of the woods. Write a really stinky letter but don't post it. Go for a real long walk. Sometimes it's easier to figure out what the anger was all about after you've let off a bit of steam! Hugs