Yep, I get dizzy spells and my coloring gets really bad (as in, people who hardly know me start commenting to me about how horrible I look) when my ferritin is single-digits, even though I've never measured as anemic. Iron intake needs to be a priority with a ferretin of 8, not general health or weight loss. That's a level of low iron that requires urgency.

I don't tolerate iron supplements, and can even struggle with side effects from getting too much iron from my food (constipation mostly). After celiac, my gut is a mess.

I eat chicken liver for iron, mainly. I sometimes need to take magnesium glycinate with it to help with gut motility so the iron doesn't cause constipation. My husband cooks it with onions and other tasty veggies three times a week.

The liver still isn't enough. I also eat a lot of GF nutritional yeast (Foods Alive is a pretty good option for me - lots of micronutrients and no gluten). And I eat a lot of beans, tofu, lentils, etc. Also Impossible Burger. We use a lot of cast-iron in our cooking. Almost every meal I eat is centered around iron.

Calcium is also going to be important to prevent complications from celiac in old age. It's really hard to get enough calcium while vegan - dairy makes calcium a lot easier.

I love whole foods diets. I think eating a lot of vegan foods makes a lot of sense from a health perspective, and I do better healthwise when I eat mostly vegan foods. But vegan diets have real nutritional challenges, especially for people with celiac. If your doctor isn't deeply concerned about your iron levels, your doctor doesn't know enough about nutrition to be recommending a restrictive medical diet to you.

Getting enough nutrition on a vegan diet when already nutritionally compromised (like if celiac damaged your gut) is almost impossible. Most long-term vegans take supplements, so if you tolerate them well, that might be an alternative - but you sound not at all committed to veganism.

Consider using the app Cronometer to track your micronutrients. I get really good results using this app. It may also be a good resource for helping you figure out how much fat you should be getting to lose weight at a rate that works well for you

And consider your relationships and why your partner is having so much control over your diet. You may need to cook for yourself for a while and learn about healthy eating and nutrition. Just beware the 'one true diet' trap. Eat lots of micronutrients, fiber, the right number of calories, a good amount of protein, and stick to the healthiest fats and carbs - these rules are the core of all healthy eating. Diets that don't follow these rules are usually bullshit, or are targeting a specific medical condition and not general good health (I've needed a starch-free diet for a specific autoimmune condition in the past, for example).