My family and I were on vacation for two weeks. When we got home, there was a weird, almost imperceptible sweet smell in the house. This entire week since we ve been back, we all experience bad lightheadedness, nausea, diarrhea, bad headaches and feeling the need to instantly sit or lay down or else we ll pass out (no one has passed out, but that is how the headaches and accompanying stomaches feel). As soon as we leave the house, all the symptoms immediately start to dissipate. We can t find a source of the sweet smell and it s so faint, you really can t smell it after about 10 minutes unless you go out of the house and come back inside. We live in a duplex and our neighbors are a sweet elderly couple who have birds, the grandkids visit often and the husband still works everyday. The other side of us is a vacant lot. What could be going on? We have 2 toddlers and I m really getting worried about what we re breathing.