Please help!feel on the brink of a breakdown...?

I recently split up with my boyfriend who i loved and still love very much.i know that sounds crazy but it was after a big fight one night...anyway,i'm now casually seeing this other guy who apparently loves me.but i'm still in love with my ex,who is still in love with me,but he's also seeing this other girl.the pain of missing him has been driving me crazy,and really getting me down.then a few days ago,my dad had an accident and almost died,and ive been helping look after him.also,it's the easter hols and ive been stuck in studying all the time...i was meant to be seeing my best friend tomorrow but she hasnt got in touch me and i think she's with her boyfriend=blowing me off =( i just feel like breaking down right now.what's up with me and what should i do?