There is no specific weight for someone who is suffering either Anorexia or Bulimia, anyone can suffer it regardless of their weight.
It might be good to get help before spiralling back into your old pattern
You definitely have an eating disorder. There is something called non specific, where you niether fit exactly into a catergory.Purging is not good for you ,EVER. NO matter how often , its so bad for your body and teeth. I have suffered from bulimia and I know its a struggle. MY advice is to not restrict yoursefl to 300 cal a day or anything under1200-1500. Your body will go into starvation mode and retain more water and food and in the long run it will make you fatter and unhealthy. Try to get on a healthy exercise and diet plan. Sometimes your body plateaus when its time to stop losing weight. I woudl also see someone like a therapist and find out what the back issue is that you have a problem with your body and food. Good Luck!