school stressing me out completely. am i going mental?

I need some help. So it is my junior year in high school and it is extremely difficult. I am taking all honors classes and a college course. i have no study halls or anything. the work has recently become very overwhelming and i can see my grades dropping. i have two C's, three B's, and three A's. My parents are very tough about my grades. i get in trouble for having a C. My GPA is dropping as well. i now have a 3.6. I tried talking to one of my teachers about the overwhelming work and all she did was lower my grade. I have been on Honor Roll for as long as i can remember. you can only have one C to get on honor roll and i have 2. the marking period closes on November 1st. All i do is do homework. It gets so bad that i need to take breaks and turn on the tv just to hear some voices because the silence is driving me insane. i am up to 2am almost every night and get a max of 4 hours of sleep. I recently talked to my parents about staying home from school because I had a test today that i know i was going to fail if i took it. i also had extra work that i needed catching up on. they were completely upset and disappointed with me but let me stay home anyways. I have been crying A LOT lately. when i talk to my teachers i fight back tears. when I'm talking to my parent about my grades the flood gates open. and forget checking power school. every time i check my grades online i cry for like 2 hours. its uncontrollable and i wish it didn't happen. i am also exhausted mentally and physically. i am a competitive dancer and i am always training. i am also in a major pageant. i feel like i never have time for myself. i also find myself falling asleep during the day like on the bus during class and just anywhere. i woke up this morning feeling very shaky. i am sweating and shaky and feel very weak. i also feel very paranoid all the time. i normally tan in a tanning bed like 2 to 3 times a week to keep up my tan and it also gives me some peace but i find that i cant even enjoy it. i haven't tanned in forever. when i do i cant close my eyes because I'm just too paranoid. i also developed TMJ last year and its getting worse. i also get ear infections a lot. i always feel like i'm doing something wrong. even when i'm talking to my friends i always feel like i say the wrong things. i rarely talk to people just to talk because i know im going to say something wrong. i often find times where i just hate myself and that leads to more crying. is there something wrong with me? i need help asap.