@feruze-- It's a great idea to pay a building inspector to look for sources of toxic mold in your apartment and building. But before you do that (because it costs a lot), you might want to stay somewhere else for a few weeks and see if there is an improvement in your health.
Can you take a vacation or stay with a friend or family member for a few weeks in another place? But you also have to leave belongings behind otherwise you might take the mold spores with you to the new place. If you fell better at someone else's home and if your symptoms reduce, this is a sign that there might be toxic mold in your home.
My sister was never diagnosed with mold poisoning but she was sick all the time like you. She moved to a new place (thankfully she was renting, so that was easy) and she got better after a few months. It was probably toxic mold in her case too. I think the best and only treatment is to get rid of the mold or to move somewhere else. I don't know how else you could get better if you continue to inhale that mold.