Acouple weeks ago I had a crazy head rush which started in the occipital lobe and ended at the frontal lobe?

After I had this amazing head rush (didn't feel amazing at all though, it sucked) I felt really dizzy, nauseous, and it became very hard to concentrate when sitting down. Now some three weeks later I still have the same feeling except greatly reduced but still enough to make it very difficult to stay attentive and awake while sitting. Any thoughts? I was on acutane at the time I had the head rush but it was my fifth and a half month (with no previous problems). I stopped taking the pills immidiately after I had the head rush.