I've suffered from panic attacks since I was 8 and although they come and go for years at a time I am currently dealing with the worst that they've ever been and I'm waiting to see a psyche, one thing I noticed is that if I've been suffering from anxiety/panic all day sometimes a wave of happiness will just wash over me and makes me feel better. sometimes it's so powerful it almost makes me cry lol, this doesn't always happen but it's a blessing when it does! sometimes it will be triggered by a happy thought or something but most of the time it's random and out of nowhere.