My dad is harassing me, HELP!!!

Well, this started out when I was around 4. Awkwardly enough, out of my two siblings, he picks on me the most. My little sister isn't bad. She's always pampered and babyed by my dad and she does bad things and teases others. My brother beats me with his fist and always puts me down by saying "No that idea is stupid and moronic." Yet I say, it's an idea, not reality, then he hits me again calling me a moron. My dad on the other hand does far, far worse. I'm going to list everything he does that's not good at all: He picks on me, calls me names like moron and stupid, sometimes he elbows me, puts me against a wall, squeezes my arms realky hard until a mark is there, he stereotypes me as a fat kid just for being 110 pounds, he NEVER feeds me or buys me food, calls me a failure in life, wants me to suffer for little things like asking if I can buy stuff from a store, ignores me, he discourages me like saying, "You'll never go to college" or "You better make me look good". I've even been getting worse, mentally and physically. I've gotten plenty of stress pimples, random emotional outbursts, anxiety, hearing and seeing things, suicidal thoughts, trying to run away, temporary blindness, twitching and shivering, heavy breathing, and in my right eye I see random colors and it feels swollen somtimes, and whenever I hear a sound, I get a migraine, I feel numb on the right side of my body sometimes. Sometimes I purely just go insane. I try my best not to let any of those things get to me, but it won't work. And when he tries to forgive me, he gives me McDonald's, yuck. I even tell him I don't like McDonalds, I prefer a cup of ginger ale or maybe just to be left alone. He forces me to build cheap knic-knacs he couldn't build like small tables and stuff. Whenever he is in the house, I get stressed and stay in my room all day until he's gone. Then there was one day I thought that I could make him happy. We have this old clock that he said he wished would work again. It wasn't working for 15 years. So I looked at it, I saw that the pendulum was too low, I moved it up and made a little platform out of popsicle sticks for it to stand on. I told him I fixed it and even proved it. He said "Like you'd fix it, only professionals can fix it." I try to talk to my mom about this, she says he sometimes belittles her and sometimes sneaks into her bank account. I'm sometimes worried about him because he's almost always gone out of the house and buys excessive amounts of blackberries and guiness beer. He treats my sister like a queen buying her everything she wishes, and I think he wants me to be jealous. What she wants from him, she gets from him. My brother is treated like nothing, eating and on the computer all day never being bothered by him. I try to sculpt with clay and draw, but I'm constantly interrupted to do chores that don't even need to be done, or work he doesn't want to do. My mom asked him if he could paint the kitchen walls, she left after he finished half of the first wall, and he told me to do the rest. Whenever I ask for even just 3 dollars for doing it he says"yeah right". Right now he's gone and this is my one small chance to tell someone who can help. Please, just please help me!