Sick but not sick

For the last few weeks I have had on and off feelings of horrible fatigue, could literally fall over I'm so tired , weakness, feeling like I haven't eaten in days but I have, headaches, body aches, nausea, shakiness, feeling very foggy, just overall feeling very sick. As if I have the flu or a horrible cold without the actual flu or a cold. Just the symptoms that make you feel like crap. I've gotten labs done, including stuff like thyroid and cholesterol etc all have come back normal except my ferritin, it's at 14. About 6 months ago it was a 6 and I didn't feel like this so I really don't think it's the iron. I'll feel fine when I wake up and then out of nowhere I'll start feeling tired and sick and it'll get worse and then after a few hours I'll feel better, not as tired not sick. It's just a cycle that keeps happening. I'm exhausted I don't know what to do or what to ask for. For added info I take magnesium glycinate 350mg once a day, and I take 50mg of progesterone everyday.