I've known a few people with Anorexia Nervosa. Not just "skip a few meals, look a bit thin" anorexia, but "detained in hospital against their will in wheel-chairs with forced NG tube feeding BMI of 14" anorexics.

It's pretty scary that they describe very similar feelings as you do, and you only did that for a few weeks.

Also, people with bulimia tend to be overweight exactly because of the cycle of fasting and binging that you describe.

I'm pleased for you that you got a good result, and I'm grateful that you stressed the riskiness.