Sounds like me a few years ago. You probably have quite a few layers of issues going on, I am not equipped to diagnose you remotely like this, but maybe if I explain my story it might illuminate something for you.
My original symptoms:
Constant infections/flu sickness
I ended up having copper toxicity and adrenal fatigue. A nutritional balancing program got rid of my insomnia, anxiety, brain fog, and racing mind for the most part. It generally improved by health by about 60%.
Now I am focusing on gut issues (candida/ parasites etc.) to try to clear up the remaining symptoms. Water Kefir, aloe vera, better diet, and ACV have already helped about 25%, but i still have a long way to go.
The moral of the story is that these imbalances lead to more imbalances so healing often involves peeling back layers (like an onion) til you find a root cause. I would recommend exploring a nutritional balancing program with the Elimination Diet and some hearty probiotics to start with.