Your symptoms are the same exact ones I had when I had mold in my bathroom. I learned later that the landlord just painted over the mold in the apartment every time someone moved out, so there were layers of mold between the layers of paint.
You should get tested for mold allergies, and if they are elevated, then this might indicate that you are allergic to mold.
Mold messes you up from my experience, so don’t mess around with it. Contact your landlord, they should be required by law to clean up the mold. Even if its a little bit in the bathroom…this is like having a couple loafs of moldie bread in there just sitting.