Do I need to psychologist?

Ok so i'm gonna start off by what happend in 2011 which really messed me and my family up.

Before my Dad's birthday ( Which is in May ) My Mum had facebook and liked talking to people who liked the band "Queen", she is obsess with Freddie Mercury lol. Anyways she been talking to a gay guy on Facebook from New York and we live in Australia, and the guy happend to be my sister's boyfriend's brother. On my Dad's birthday my Mum sent gifts to the guy from New York. My Dad got so angry, He hates gay guys too and he was jealous of how the gay guy is getting more attention from my Mum then he is. Because my mum always sat on a couch, drinking wine and talking to him on facebook with her phone every night. Ever since then my parents have been fighting almost every night and some nights there has been hitting, pushing, throwing stuff, slapping involved. They broke their phones and kept replacing them alot of times too. Then my Dad bought alot of expensive furniture for my Mum and me and my sister's and brother never got to go out for weeks after that. (before that happend we only went fishing and gone to the beach, we can't afford to go to really great places, i never been overseas or camping with my family before and im 15 lol, but im not angry at that, i mostly just appreciate of being born and having a roof over my head and having technology) On christmas day family members came over for turkey and they happend to be talking about gay guys and my dad pointed a finger at my sister's boyfriend and said " i will kill your brother " and then he got really angry and it almost went to a punch up fight cos he said "get George (my dad) away from me before i hurt him " and they left pretty quick. Oh and one time in about october they fighted and my dad slapped my mum when she was at the toilet, she started screaming and crying so i called the cops and my dad went to jail for only 4 hours... and he has a DVO on him now but he has broke the law of "behaving himself to my mum and not to hit her" which he has down this year "2012".

Anyways during that time i've been getting stabbing pains in my chest and ribs and some of the fights they had made me cry. And not that long ago about 3 days ago i just got the worst stabbing pains where my heart is. I just stretched and then it just stabbed me to 7-8 times and it made me cry, it was worser then last years stabbing pains but anyways to the main reason of why i need to see one...

i did something stupid... i been going to a school which is kind of new to me.. not really anymore but i moved to a college this year and i hate it and i have no friends (we ended up moving last year in november) so i decided to just not do assignments and try to avoid school (thats the stupid part)

and some mornings my dad hurted me and my mum and they yelled at me and stuff

during that time i had a horrible feeling inside me, it was a depressing feeling type.. it's very hard to describe but it just felt horrible and made me feel miserable and regret everything, everytime i got into a fight with my parents i think of unpositive things i repeat in my head "i hate them" and like 2 minutes after the fight happend and im in my room i get a feeling in me making me want to hurt myself so i just start pulling on my own hair and try to hold it in but i dont so i started hitting the floor and think of suiciding cos life is not worth living... ever since then i never sleep well and i still dont im always tossing and turning thinking of school and stuff. sometimes i go to the kitchen andd look and sometimes pick up a knife and think of cutting myself but i didnt cos there was always someone else in the kitchen like my brother. so after the fights i scratched my skin till it turned red, and one time my dad started pulling on my arm and i started screaming at him uncontrollably (it was weird cos i didnt think of screaming or anything it just happend, and it was louder then i expected) and i started hitting him and eventually when he pushed my onto a chair i couldnt breathe properly, it was constant short breaths in and out and i tryed to slow it down but it was hard so i holded my breath as my dad was still yelling at me.

Umm that's all i think... I'm sorry that its so long and i would be so thankful for using your time reading this unpositive story. :( i would also be really greatful for yuh to answer this, do i need to see a psychologist?