my mother is not accepting of mental issues. she tends to see it as a weakness, or just a desire not to calm and think rationaly. she doesn't call my bipolar by its name, she says i'm just depressed and when i go manic she calls it healthy energy. clearly she is wrong. however my point is too show that people close to the situation have biases and sometimes are not right.
you need to see a doctor. i had such a hard time with my episodes of depression then hyperactivity that i went to a emergeny psychiactric facility. i know it sounds dramatic, but it isn't so bad. i talked to a few doctors there and they recomended medication and therepy and informed my regular doc of all their findings.
just talking to an objective source was so comforting. now that i have a better understanding of my anxiety i can speak with friends and reletives, hear their side, and compare it to the clinical and find my happy medium.
it is still a major issue in my life, but i find i am grounded better. ask your parents to take you to the doctor for your racing heart and the dizzyness and while you are there ask the doc about the anxiety. it'll help.
as for the state of the world, itis terrible, we should do everything we can to do our part, but you can't let it consume you. let it drive you. perhaps you should look into volunteer work. you sound like the perfect person to lead a club or group in school for activism.