<s>[INST] woke up dizzy after sleeping on my left side, rolled to my right until I felt my equilibrium somewhat normalize.  I had an AVM of the dura a couple of years agobefore, but it was repaired before it burst or bled. I also had a concussion a few days ago. [/INST] Hi,Thanks for writing in.A concussion is very mild brain injury and does not usually need treatment. Dizziness occurring only once needs further observation. If there is persisting dizziness then you may need to consult a neurologist and get a CT scan done to look for any problems in the brain. </s>