Random Fret

I am becoming reluctantly suspicious that we may have mold in the house somewhere. In fact, I know we had SOME, because it was visible in a corner of our bedroom ceiling, a corner that faces outdoors on both sides and is very very cold. ALso, we keep the heat really low in our room since we spend very little time in there, so I wasn't super surprised to see it creep up and I cleaned it with Lysol and it's gone. It was the garden variety type that appears in particular on the corners and edges of the white, newer type windows all winter long, the kind you just have to wipe away, and which the internets assure me is fairly harmless.

BUT. We have all been so lingeringly, stubbornly sick all winter with sinus-y issues and coughs, especially me and the baby (i.e. the only two who actually SLEEP in our bedroom, generally) that I am starting to think we should maybe have an inspection. I also worry about the bathroom area, because it doesn't have an exhaust fan (old house + two people not super inclined to do Projects beyond the kind requiring glue sticks and glitter) and I wonder if it's possible that somewhere behind that old plaster ceiling and walls there is just a hotbed of disgusting damp mold reeking havoc with our respiratory systems. If it were just me I'd probably continue to ignore it, as is my way, but since our kids are involved I feel a parental obligation to do something.

However, calling someone to investigate a suspected problem basically seems to me like TELLING them, "Feel free to claim there's a problem, whether there is or not, because I will never know the difference and now that you're here I will almost definitely whip out my checkbook and pay you whatever you require to save Mah Babies from this potential, unseen danger." You know?

Anyone have any suggestions of more concrete ways to feel at least Fairly Certain of mold, rather than just suspicious? Or stories of mold problems you know of that were happily resolved? Or stories of kind hearted contractors who came to check and then said, "Nope! All clear here; you guys must just have crap immune systems and will have this cold the rest of your lives!"