Probably (possibly?) the poster is from the UK.  Several posters in
the past have used that term in 'common parlance' from where they are
while, as you said, it isn't often used in North America or other
parts of Europe etc.
  Many terms might vary depending on the origin of the message.   UK
medication like I use (in Canada) is called 'Tegretol Retard', while
our's is called Tegretol Controlled Release or XR in the U.S.?, and
the former term might be taken as a negative phrase, in slang in
N.America.
   The origin of the older phrase you commented on was similar to
'fits of rage'  or loss of control?, and was more common before some
of the szr. causes and types were understood.
  I think it was somewhere on Julie's Idaho website that some former
cultures regarded szrs. as part of 'possession'  by evil spirits or
the devil and there were probably several people put to death for that
possession to 'protect them'  from Fall from ???, rather than trying
to treat them with compassion if not with medications or things that
might help reduce their szr. frequency.     G./