Sooooooooooo angry

I hate it so much how my mood can just change so quickly...doesnt even give me a chance to get help first..It scares me because what if one day im fine and then the next minute i decide im going to kill myself......my mood goes down so quick I wouldnt have a chance to stop myself.....I know,it sounds weird.....but its like something just takes over my mind...not that I feel like my mind is ever mine anyway. I dont think things would get that far though..but it might happen.....NO IT WONT....ok sorry not making much sense here huh.