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natalie - thanks so much for your reply. It is really hard to describe

That's great it has stopped for you! Luckily I am pretty healthy and get blood tests for an unrelated reason every 6 months or so. My vit B is on the lower side so I am taking supplements, but everything else is good including my vit d.
I am in recovery from an ED so unfortunately can't embark on any kind of diet that restricts certain food, but I try to eat healthily in general... I am seeing my therapist tomorrow and am going to ask her about it.