Hey lately i have been occassionally waking up in the middle of the night and rolling over and when i roll over i feel like i can feel the fluid in my inner ear moving around. it makes me very dizzy and makes my head throb. anyone know what could be causing this? normally once i go back to sleep then next time i get up im fine but today i woke up at 3.45am with head spin, went back to sleep and woke up at 7am still having headspin. anytime i put my head down low to pick up something etc i got a head spin and it has happened for a full day. it is quite worrying so any advice is greatly appreciated. thanks