ugh. that would make me furious.

i wonder if (since you said you are not an "on your feet" thinker - and i wouldnt be either, if i was seeing red!) - oh yeah - i wonder if maybe you could write out your history, or even better - get your therapist to write a letter confirming that you have not engaged in unhealthy eating behaviours for over 20 years now and that you are firmly committed to maintaining that and will not let something that far removed endanger your current health concerns.

i dont think it's worth the effort of educating people (i mean, it probably is - but when you're tired & stressed anyway, it's not really your responsibility, yknow?). so i was thinking, just fight fire with fire, and pull out the letter from your treating professional - Drs tend to listen to each other before they will ever listen to the real expert - the client .