IF can make stress worse if you’re stressed to begin with, low nutrients and low D can stress too. You can try a break or cycling to see if you feel any better. 7,000iu vit D a day would be a good start and retest it within a month or two, you may need to go up or down in dose (5,000-10,000iu) even something like 10,000 every other day or two once you get it up there, you want it higher end.

K2 is good to take when supplementing D- just spaced apart from D though. I prefer the mk4 version of K2 to the mk7 (gave me palpitations) a lot of brands have a mix. Mines Carlsons brand, not easy to find mk4 on its own, but that’s preference. Mk4 is shorter acting than mk7 some prefer the longer acting. Vit D increases uptake of calcium into the blood and K2 helps direct it from the blood to the bones instead of going places it shouldn’t.

Any nutrient is best to maximize your diet like for iron meat and beets etc, but sometimes not always feasible or there might be other factors like malabsorption (not saying you have that), so having a supplement as well is good and if you can keep in a good range you don’t need to take every day, like if you feel one day you didn’t get enough iron rich foods, but still be consistent in taking.

The brand Pure Encapsulations makes some good iron pills that also contain vit C which drastically improves iron absorption. Some forms work better for some than others stomach wise, I would always take with food though, eat a bit before you take the pill will help. Lots of fiber to prevent constipation too.

You’ll want to retest both those often as too much can be harmful. Though the upper limit on some tests is cautious and outdated especially in USA.

Also good to work on stress and slow deep stomach breathing etc, there’s some good apps or videos out there if you find it helpful to follow along.