dream like panic fog

at times like i know what reality is but i do not always trust my thoughts...i will have a flash of what feels like a dream and a panic feeling comes over me but i know what is real and not but then i go back and forth between telling myself its all ok focus focus and losing focus and feeling a panic
im not sure what it is or what would treat it
i also often have a fog...i feel like i cannot think a full thought like my mind skips and i lose place of where i was thinking