I'm so scared, my chest just keeps having this weird kind of tight feeling. I'm trying to tell myself it's just panic attacks, but I just don't know anymore. It feels like my heart is too slow and or is going to stop. I'm more scared because Im a hypochondriac and read some things on heart attacks, months before the attack you can have insomnia and anxiety, I'm just so scared. Another symptom is your jaw hurting, which mine sometimes starts too, I'm scared.