I have been told by my son s pediatrician to have my home tested for mold. He has had respiratory problems since birth and must use a nebulizer frequently. The house has a cement basement. I heard of a news story about home testing kits that one can get. Given the nature of the health problems you describe it is quite probable that your son s health problems, as well as your own, are associated with you home, and exposure to mold.
Older houses are at greater risk of having mold infestations then relatively new houses.
In studies that we conducted in Australia, houses greater than 20 years of age had significantly higher airborne mold levels. The reason for this is that with the passage of time there is an increasing probability that some thing will happen to cause a mold infestation problem. This may include plumbing failures, high humiditys in basements, storm damage, etc. Nature is not kind to houses. Humans have to work at it to keep the forces of nature at bay.