Well, unfortunately - and luckily - it's somewhat personal for everyone. This is unfortunate because you can't be told exactly what it is, but lucky because the possibilities are endless.
Being in survival mode, anxious, fearful, etc., are easy ways not to experience ups. That makes sense biologically, right? If the tiger is chasing you, you don't want to stop and smell the roses. I personally would say for you, before seeking "ups" you should try to find a "not down," some time when you can breath and not be worried, even if only for a few minutes.