i used to have the exact same problem until one dream changing lucid what i did was i dived into a really deep pool which for me is calming as i a a competitie swimmer and spend most day at the pool so anyway i sank right to the bottom and just sat at the bottom of the pool meditating and its unexplainable the feeling its almost like and intense high it feels like you can do anything and are completely free so i suggest find what keeps you calm in the start of the dream and try meditate but i know that is time consuming good luck and well done