THIRD EPISODE OF RIGIDITY WITHOUT LOSS OF CONSCIOUSNESS

MY 24 Y/O SON HAD AN EPISODE ABOUT 2 YEARS AGO AT WORK REQUIRING PARAMEDIC ASSISTANCE.
HE FIRST FELT TINGLING IN HANDS AND THEN FINGERS STARTED SPASMS AND CURLING RIGID, WAS TOLD IT MAY BE A PANIC ATTACK BUT NO PHYSICIAN SAW HIM.  HE WAS "HUNG-OVER" FROM A LONG NIGHT OF DRINKING.
YESTERDAY A SIMILAR THING HAPPENED AT WORK. EXCEPT THIS EPISODE REQUIRED PARAMEDICS AND AMBULANCE TRIP TO HOSPITAL.  THE EPISODE LASTED LONGER AND INVOLVED MORE OF HIS BODY PARTS.  HE WAS TOTALLY CONSCIOUS AND ABLE TO TALK TO MEDICS.
I WENT TO HOSPITAL ER TO ATTEND TO HIM 5 HOURS LATER HE WAS TAKEN INTO AN ACTUAL ER ROOM AFTER HAVING A BLOOD TEST.  WHILE WE WERE IN THE EXAM ROOM WAITING FOR PHYSICIAN FOLLOW-UP, HE SAID MOM 'I AM "TINGLING"AGAIN. I THINK IT IS GOING TO HAPPEN AGAIN'.  AND IT DID. I WAS THERE TO SEE FIRSTHAND SOMETHING THAT I DONT WANT TO EXPERIENCE AGAIN.  HIS FINGERS STARTED DRAWING AND HE SAID THEY HURT AND HE FELT LIKE HIS INSIDES WERE CLOSING UP.  I CALLED NURSE WHO IMMEDIATELY PUT B/P CUFF ON AND HOOKED HIM UP TO MONITOR AND PULS OXIMETER.  IT GOT PROGRESSIVILY WORSE BUT NO LOSS OF CONSCIOUSNESS HE WAS TALKING AND SAYING IT WAS PAINFUL.  I STEPPED OUTSIDE WHEN HE SAID HE COULDNT BREATHE AND WAS ABLE TO GET A PHYSICIAN TO COME IN AND SEE IT FIRSTHAND.  AN INJECTION OF ATIVAN WAS ORDERED AND AFTER ABOUT 15 MINUTES HIS FINGERS STARTED TO RELAX SOMEWHAT AND HE WAS ABLE TO MOVE THEM AGAIN.  IT WAS THE MOST HORRIBLE THING I HAVE WITNESSED AND I AM IN MEDICAL FIELD BUT I GUESS WHEN IT IS YOUR OWN CHILD, IT HITS CLOSE.  AFTER A CT SCAN LAST NIGHT AND MORE BLOOD TESTS, NOTHING WAS CONCLUSIVE EXCEPT THE TESTS WERE ALL NEGATIVE.  HE HAD BEEN BOWLING THE NIGHT BEFORE AND DID DRINK AND HE DOES DRINK IN EXCESS WHEN HE DRINKS. HE DID TEST POSITIVE FOR MARIJUANA LAST NIGHT BUT NO OTHER DRUGS ON TOX SCREEN.  DOCTOR SAID POT WASNT AN ISSUE.  COULD THIS BE ALCOHOL RELATED?  HE HAS DECIDED THAT HE WAS SO SCARED LAST NIGHT BECAUSE THIS WAS MUCH WORSE THAN THE FIRST TWO, HE I SWEARING OFF DRINKING.