Yes molds and mildews can cause nausea and vomiting. They also cause sneezing, runny nose, cough, shortness of breath, fatigue and headache. Improve ventilation of your house and repair leakage.
Yes I completely relate. My family once lived in a parsonage that was full of black mold. I was preg. When we lived there and took my new baby home there after he was born. He and I were sick the whole 2 yrs we lived there til we could move. Due to the mold I developed serious sinu problems, 3 out of 4 sinuses are occluded, and I have a deviated septum too., My son has allergies also. Headaches, sinus allergies even stuff like pneumonia etc (me and my son both had that) can result from mold exposure. And your clothes can and will smell like it and even could mildew too. This is a hard problem to deal with.