For a healthy adult, black mold in the house is very unlikely to be lethal, and it is worth saying that plainly because the internet loves to terrify people about this. What it genuinely does is make people sick: respiratory symptoms, headaches, fatigue, worsening asthma. The stakes are higher for infants, the elderly, and anyone immunocompromised or with chronic lung conditions, where prolonged exposure can lead to serious complications.
So the right frame is not panic, it is urgency. Every week the colony grows, the exposure continues and the remediation gets bigger. If someone in your home has symptoms that improve when they leave the house, that pattern is worth taking seriously. Nonstop Restoration will inspect for free, tell you honestly how bad it is or is not, and if remediation is needed, contain and remove it safely to IICRC S520 standards.