It’s very serious. I had a leaky roof, and then the mold problem, which was minor, grew exponentially. I had to move out and leave behind everything I couldn’t soak in concentrated hydrogen peroxide or throw in the dryer. I had to move more than halfway across the country to somewhere less expensive.
As a result of the mold, my mother and I (she lives with me) developed severe chemical sensitivities that require an extremely restricted diet and not buying new plastic things (the chemicals that gas off are similar to those found in mold), which limits my life further. I’m still having to see an expensive specialist, who says the problems come from mold toxins stored in my liver. I’m getting better, but it’s a LONG road to recovery. My mother is so sensitive that she can’t take that specialist’s medicines, so she’s having to look for someone else.
Get a mold expert to look at it. You may have to do what I’ve done.