Last dec. I felt a vibrating in my chest & was put on ativan (lorazepam) for anxiety. Now it's in my head, is still constant/intense with citalopram (& trazodone to sleep). Also a bit dizzy. What could this be?

Ask the doc. Since you are being treated for what appears to be anxiety/mood disorder these are good questions to be asked to your psychiatrist.
Different directions. There are many different possible causes of the sensation that you feel, from infections to anxiety and many in between. I assume your physician performed an exam and several tests before giving you ativan (lorazepam). However, since the sensation has moved to another area i would suggest an exam by an ENT physician. Perhaps a fresh perspective will provide answers.