I'm wondering, and also coming to the conclusion the main culprit in anxiety/panic attacks and making us feel bad could be in the breathing unnatural pattern we start doing when we get anxious etc. I noticed last weekend I woke up feeling a little anxious had no idea why, went out to enjoy the sunshine and as soon as I left my house I was starting to feel worse and shortly afterwards I noticed I was breathing (unaware) like a complete idiot, breathing deeply and holding my breathe for longer than usual, I'm pretty sure these pattern start tricking your brain that something might be wrong and cause hyperventilation and panic attacks etc?