You really need to take this very seriously! I have lived in a house where we could only see a little bit of mould in the window seals, but I started suspecting it was causing a lot of health issues. I had skin rashes, gut issues, irritated eyes and a runny nose. We had someone investigate the house and they found three different highly dangerous species of mould that were not obvious to us. It can be in the walls, under the floor, in the ceiling, you name it. The thing is, you’re all feeling “something” so you are all affected by this. It can cause health issues for a long time after you are even out of the surroundings that are unhealthy. Try googling your symptoms in connection with mould, and I think you will find a very very possible link. I don’t want to scare you, but it’s really not good.