Sometimes I get shaky & dizziness that's sudden and lasts maybe 20 seconds. Feels like I'm going to fall on the floor; even when I'm sitting down. The room gets one big shaky/lurch and then it's gone. This is usually prior to a migraine attack. Accompanied by dizziness. I've no idea what it is. Catches me by surprise 🙁 Not a horrible symptom, just jolting and uncomfortable.