i don't know if that explains it properly, but sometimes i'll be absent minded and ruminating  and i will have a thought that will trigger a visceral response, like my heart will palpitate, feeing of doom, etc etc but then when i'm consciously trying to reach the thought and dissect it i can't remember what it was. so basically i get left with this feeling of just dread that i need to do something to fix that anxious energy but i can't because i don't remember what it is to even fix it.

usually my anxiety is more exaggerated reactions to things that are actually happening - like i did a bad job at work, think i've upset somebody with a comment, did i leave my oven on? and i've gotten pretty good at managing that but i don't know any exercises to help me with an unknown trigger