@rinah20 I'm guess you know that low iron can cause a number of symptoms, many of which you've shared.

The following is an excerpt from the link I've provided below:
"Iron deficiency anemia signs and symptoms may include: Extreme fatigue. Weakness. Pale skin. Chest pain, fast heartbeat or shortness of breath. Headache, dizziness or lightheadedness. Cold hands and feet. Inflammation or soreness of your tongue. Brittle nails."

-Iron Deficiency Anemia:
https://www.mayoclinic.org/diseases-conditions/iron-deficiency-anemia/symptoms-causes/syc-20355034
Also from the article, but something I thought was worth pulling out is a list of iron-rich foods as well as foods high in Vitamin C which will aid in the absorption of the iron-rich foods:

Foods rich in iron include:
•Red meat, pork and poultry
•Seafood
•Beans
•Dark green leafy vegetables, such as spinach
•Dried fruit, such as raisins and apricots
•Iron-fortified cereals, breads and pastas
•Peas

Your body absorbs more iron from meat than it does from other sources. If you choose to not eat meat, you may need to increase your intake of iron-rich, plant-based foods to absorb the same amount of iron as does someone who eats meat.

Choose foods containing vitamin C to enhance iron absorption

You can enhance your body's absorption of iron by drinking citrus juice or eating other foods rich in vitamin C at the same time that you eat high-iron foods. Vitamin C in citrus juices, like orange juice, helps your body to better absorb dietary iron.

Vitamin C is also found in:
•Broccoli
•Grapefruit
•Kiwi
•Leafy greens
•Melons
•Oranges
•Peppers
•Strawberries
•Tangerines
•Tomatoes

Have you been actively addressing your low iron, or do you think that could be part of the problem with some of your symptoms?