Can't control enotions

I get over emotional about everything randomly ill get really mad or really upset and ready to cry when me and my bf disagree and ill tell him im done or think to myself im so done with this relationship even though i dont mean it and ik i dont and he knows it at the time i feel that way because i get so emotional i can't control it then later i might go back normal and just say i love you... Idk if its the pms or the pill.. Anybody have this problem