I suspect I have general anxiety disorder. Whenever I worry my heart feels heavy, my chest feels there's an uncomfortable weight on it. My heart starts to beat fast, not too fast, but fast and consistent throughout the entire day. For example, I recently starting getting anxious about my girlfriend not sending me anything for 4 hours despite never once being worried about it in the past. I don't understand why I'm suddenly exhibiting these kind of behaviour. Is this normal?