How to Prevent Panic Attacks |

Ignoring NEVER works, or else he would be an angel by now, or saying something that shows that I don’t care about his comments.
This is what he normally says, trying to make fun of me but doing a bad job (he does it in an annoying voice that he claims sounds exactly like me, his name is Eric by the way):
Oh my gosh, Eric, get away!
I don’t know what I’m doing and you do and you’re trying to help, but you are being annoying! (In reality he is just treating me like dumb dirt)
Quid maging fun of me! (He claims I talk like this and this is always how he talks, I even tryed saying he must love the way I talk to imitate it all the time for while, but it didn’t work)
Sarcastic remarks like (when I get mad and stomp or something when I am playing piano or bang on keys but not too hard):
Oh yes, because getting mad is totally going to help.
And if I say something wrong the first time I say it he will say "What? What is–" even if I try and correct it.
Last night I had my last of his remarks when I had to turn on a light in my room after dark (the room was dark) and I am so scared of the dark that I will have a panic attack and cry if I have to be alone in the dark. I tried to go but I ran to him and said
Me: Will you please turn on the light for me?
Him: Do it yourself.
Me: I’m scared.
Him: "I’m scared (in imitating voice)." Quit trying to act cute.
Me: I’m not TRYING TO ACT CUTE.
Him: That’s a first.
Me: FINE I’LL GO.
It made me so mad because I almost cried when I had to turn on the light and he is under the impression that everything I do isn’t because I want to, it is because my friends are doing it/I want to make a scene/I am trying to act cool/cute, but at least I have over five friends, he only has ONE! And he is almost 17.
Don’t tell me to ignore it, I do. And I am tired of it because all he cares about is playing his video games and playing on the computer and to him I am just a distraction from both and I should get out of his room, I can’t tell him anything without after finishing, him saying something like what I listed above, being screamed at to get out, or him imitating what I said like I am dumb. I have…rats (pets, they are different than wild trust me) and he hates them and they had to be moved to his room and we were supposed to trade rooms but he decided he loves his room too much to move. He is in there all day and when I take my rats out (on my shoulders, they are supposed to get an hour out of the cage a day on the floor but NO, he decides to threaten to release them into the wild if I put them on his floor) and talk to them, he says I should get out of his room and they are stupid and stuff (I learned to ignore it) and then starts making fun of me about how I love my rats.
So sorry for being long but is there any way to make him stop? I mean one time someone said "I love my brother do you love your brother?" and I said "Sort of," because that is how I think of him. She was shocked. I barely love him and I want to love him more but it is hard when I don’t feel I am welcome to go within 10 feet of him. I know everyone with brothers faces similar problems but they are making mad and I feel so guilty for not loving him as much as I should and the not loving him like I should is the only part that is making me actually cry!
I have a few things to let you know:
I barely ever get upset in front of him.
I don’t have much money to buy games, and he usually plays on the Wii, and those games are expensive…but I will get money soon!
He is sarcastic to me, not the other way around. I usually just take it seriously and act like it isn’t sarcasm to try and make it seem like I don’t care, but he still continues.
He’s older than me.

My advice would be to let him do one more thing and just completely blow up on him. Just let him insult you one more time and just blow up on him and call him out. Throw stuff at him too and take your rats.