How can i finally get rid of chronic everyday migraines and neck pain?

Iv had a lot of stress and trauma in my my life, and i have been depressed since i was 11. Although i do have a significantly negative view on the world i've never given up nhope that there is happiness that maybe one day can surround my life. However, all the stress and pain has caused me to experience everyday chronic pain in my neck, back, jaw, and in the form of migraines (which i have had everyday for 3 years believe it or not!!) These problems cause me to have bad visual disturbances, bad concentration, brain fog, and even fuzzy hearing!! In a way I've got used to the pain but I've slowly become less passionate about life, and more miserable. Even worse than this, i can't hold down a job, and have attempted college 3 times!! But either quit because the pain of trying to concentrate is too much or i get dismissed because i can't perform well and im so melancholy. I see a chiropractor twice a week. He told me that it's a nerve condition. Apparently, the stress has become toxic in my system and my joints and muscles have locked up, causing intense nerve irritation. It seems like a good explanation and i do the exercises he tell me too. However, i've been seeing him for 6 months and im still in pain. Becoming more stressed is supposed to make it a lot worse and being positive helps, but how can i?? Its just one big miserable cycle i can't break. I don't even know if what he says is true. Either way i just need help so bad before i give up hope. Please anyone???