To answer some of your questions:
I have had a Vitamin D deficiency several years ago. I am taking a supplement for that and have for years. My Drs keep a close eye on that, just one of many things I am being monitored for.
I no longer have the anemia. Being gluten free corrected that. I understand I would have to go back on the iron if I decide...
I was diagnosed almost 3 years ago. I never had any of the usual problems. I had anemia and while trying to find what that was from, my GI found the celiac. I immediately started a gluten free diet, but it has always been a struggle. I am not the healthiest eater and would always seem to get the processed gluten-free items. I am not much for veggies and fruit...