i have really bad mood swings... help?

[Katy]

i don't really know how to say it but here: one minute i will be all oooohh i love you so much your so amazing and the next i will yell and scream. the other day my friend and i we having so much fun just me and him goofing around and then he gets up to move to another spot and i freak out and say ' omg where are you going why would you leave me like that?!' i don't know what came over me but i have this crazy fear of being left alone and not having anyone care about me, it isn't something i can get over because me and my mom had a rough like 3 years of constant arguing and her telling me to die and that i don't deserve to be alive and that i am a failure and her just leaving me to take care of my sister at like 8 years old so she slept all day and when she was gone she would leave for hours and when she wasn't sleeping i would get yelled at for eating left overs and stuff so i have abandonment issues and i just don't know what happened but i feel really bad that i yelled at him that way like i did.