First entry having a hard time coping with the pain and anger over it.

I am having a hard time not being angry all the time. I am so sad that all the time I just wish I had the courage to kill myself. I love my wife and kids and mom and dad too much to do that but it is always on my mind lately. All I do is get mad over and over and rant about the most trivial and mundane stuff that would never bother me normally. I yell at my wife about stupid things. I have completely isolated myself off from everyone I know. I find no enjoyment in anything I do. I cant make myself cheer up. those around me try but im so sad about being in so much pain that I cant pull out of it. I need help. I am lost Spiritually and lost mentally as well as so tired of this losing fight against the pain..... I NEED HELP! I AM LOSING THIS FIGHT!