MUSICAL PERFORMANCE ANXIETY HEADACHES

I AM CURRENTLY A MEMBER OF AN A CAPPELA SINGING GROUP (CONSISTING OF 4 MEMBERS, INCLUDING ME).  EACH YEAR WE ARE INVOLVED IN A REGIONAL COMPETITION.  WITHIN THE LAST 5 YEARS, I HAVE EXPERIENCED THE ONSET (WHILE ONSTAGE) OF AN EXCRUCIATING HEADACHE (NO WARNING SIGNS) 4 OR 5 TIMES.  THIS HAS NEVER HAPPENED TO ME BEFORE OR SINCE...ONLY ON STAGE AT THESE COMPETITIONS.  WHILE PERFORMING, I HAVE BEEN UNDER THE INFLUENCE OF ABOUT 20 MILIGRAMS OF PROPANYLOL (INDURAL) TO LESSEN MY PERFORMANCE ANXIETY.  IT HAS ALWAYS SEEMED TO HELP BECAUSE I HAD LITTLE OR NO NERVES WHILE BEGINNING THE PERFORMANCE...THEN, LESS THAN 1/2 WAY THROUGH THE PERFORMANCE, THE HEADACHE HITS ME AND PRACTICALLY TAKES ME TO MY KNEES.  IT TAKES SEVERAL HOURS TO 2 DAYS TO COMPLETELY DISSIPATE. I HAVE NOT SEEN A DOCTOR FOR THIS YET.  HAVE YOU EVER HEARD OF SUCH A THING?

[suzi-q]

Sounds like that maybe the medication for the anxiety could be causing the headaches.  Do you ever take the medication at other times without the headache occuring???  Could it just be extreme tension or migraine headaches because of the anxiety even though you have medication?  Could it even be the lights above you???  Just suggestions!!