Could you have possibly have had a reaction to the shot they gave you? Can you induce hallucinations manually? By thinking about it?
MRI is a good first step. Brain tumors could cause this.
The sensations on top of your head could be a new skin condition or auto immune condition that appeared. Stress can cause a lot of weird problems.
edit on 19-7-2012 by milkyway12 because: (no reason given)