I would tell him/her about (the extent of) your problems. If it's a chronic problem and your psychiatrist doesn't listen (not assuming he/she won't), I would ask for a second opinion. Telling about the extent of the fear is important, because it could be thought of as an anxiety disorder otherwise. If you doubt something might happen but you don't (strongly) believe it will, it might even be due to anxiety only, but if it's not an antipsychotic can really set you free.

Ask for an earlier appointment if need be.