Is it normal to have this severe of mood swings

sometimes i get so angry/ violent i feel like i need to kill someone, sometimes i even contemplate putting it into motion. i think about how i could pull it of in a way that would identify something, at such times my handwriting typically changes in to a nasty scrawl familiar to that of a feral child, even my speach/ writing speach patterns change, is it normal for it to be this severe? or seeing as i developed many personas over the years as a method of self preservation could it mean that this is something more, please no rude or nurt ful comments, im just looking for some insight.