Bulimia questions it's urgent please help?

I have been purging for about 4 months on and off maybe once or twice a week 6-7 times a day. I recently stopped for three weeks but the thoughts are coming back and I can't control them any longer I purged for the first time in three weeks today and it felt horrible i got this horribl heart pain where I had to sit down it hurt so bad . What is that pain? And also if I only purge sometimes on and off am i bulimic ?