@happywifehappylife Hi OP, lifelong (genetically inherited) anaemic and also vegan of almost 5 years and before that was vegetarian for 18 years. Also as someone with a history of ED/restriction.
I saw some other comments mentioning things along the lines of what I am about to say as well; it sounds more like your doctor is pushing his personal opinions more than his professional ones. Additionally, I had the same issues when I was heavily restricting, and no doctors I had been to ever suggested that I eat meat. They just suggested I eat
better (basically more than x amount of calories a day, and more variety) so more or less, get enough calories and hit your macro and micro targets.
I’m obviously not a doctor so I can’t tell you what your numbers or levels should be, but I suggest finding a vegan friendly/supporting physician to discuss your overall health and nutritional goals with.