I can so relate to this. I say all the time "I just never feel 'good'" it hasn't always been like this. I would go through short periods where I didn't feel good all the time but now I would say I rarely feel good. I'm also dizzy or 'spacey' like I'm going to fall over. Or light headed and nauseas. And so naturally I worry all the time about how bad i'm going to feel when I'm here or there. I went through so many medical tests and nothing turned up. Thats when I finally started getting treatment for anxiety (about two months ago). If i'm not dizzy or light headed then I'm just really tired and lethargic. And of course any little twinge in my body I immediately think it's a signal for something really bad. Especially in my chest. The least tiny twinge I get convinced is a sign I'm about to have a heart attack. I feel like around most people I hide what I'm going through well. In reality I just can't wait until I can be back home in my bed trying to relax.