You may have better success in a smaller caloric deficit. 1000-1200 calories a day is very few and that’s a very fast pace of weight loss. Try removing 500 calories or 10% of your calories. Progress will be slower, but you may feel much better.
Also, as a sibling comment alluded to, when you have fewer calories to eat, the micronutrients in the few foods you do eat matter that much more. The nutritional quality of food you need to stay healthy increases greatly when in a caloric deficit. Fruits and veggies are great for helping that, and multivitamins are cheap insurance policies to make sure you aren’t deficient in anything important, IMO. YMMV. Best of luck with your goals!
Also, as a sibling comment alluded to, when you have fewer calories to eat, the micronutrients in the few foods you do eat matter that much more. The nutritional quality of food you need to stay healthy increases greatly when in a caloric deficit. Fruits and veggies are great for helping that, and multivitamins are cheap insurance policies to make sure you aren’t deficient in anything important, IMO. YMMV. Best of luck with your goals!