Emotions

Okay so for the past 4 months my emotions have been out of whack. One minute I happy and the next I just want to cry. They have been every where and I feel bad about it cause I can't control it and I have noticed I have pushed some really close people away because of it. One minute I'm happy,laughing,then I'm mad and want to kill someone(not really but I'm pissed),then the next I want to cry my eyes out,then I'm happy again instantly! It's crazy! I really don't know what to do any suggestion !?? I would really appreciate it. I don't think it's because of my cycle because it's an all the time thing.