I'm in the same boat as you, on and off for 15 years, I quit for two years and then tried again this summer. First few times I was fine but now for 3 days with a migraine it feels like someone is bashing my head in and kinda feel dizzy. This is scaring the sh*t outa me and I'm trying to bring myself to throw the last bit away. I felt soo good for the two years I stopped I don't know why I was soo stupid to do that again. I hope I don't have a heart attack or a stroke from this. Please, anyone reading this, don't ever think about starting. Even if it doesn't ruin your life directly, it will ruin your state of mind permanently.