Exposure to mold over time can cause a lot of confusing effects. I lived in a nice, new condo for years and got progressively sicker, but never suspected mold.
At first, I developed a touch of asthma, then allergies to dander and pollen, Then I got eczema. I gave away my cat, and ripped out my carpet thinking that was the problem but no improvement. After nine years of generally feeling unwell and getting more and more allergic and asthmatic we were horrified to learn our building was a "leaky condo". Sure enough when they ripped apart the wall it was full of mold. It never smelled and we never had any visible signs. My advice is that if you suspect mold, get an inspector in to check your air quality. It is worth the money!! Its a long road back to health after long term exposure.