Double Edged Sword

I've recently discovered (well not so recently) that my tongue is not attached to my brain. It seems that when I am upset, I am very quick to spout off the most hurtful thing(s) that I can say. This has been happening alot lately and it is something I am not proud of. I hurt the people I should not be hurting. I have also noticed that I tend to druge things up from the past and should not be brought up, therefore opens old wounds. I am trying to work on this, but nothing seems to be helping or working