Is there any staining or watermarking present on drywall near the source of the odor?
OR I think mold is making me sick. If you CAN NOT see the mold but suspect you may have a mold problem due to possible suspected health impacts: Mold is only one of many potential indoor air quality contaminants that can lead to health consequences. If you suspect this to be an issue, feel free to call for an individual consult and one of the experts at ProStar would be happy to ask you a series of clarifying questions that may help you to determine if Mold and resulting poor indoor air quality may be an issue in your home. However, if health issues are your primary concern and you can see no visible signs of mold growth, often the best first step is indoor air quality testing provided by a reputable firm. ProStar would be happy to provide a referral to a reliable and knowledgeable firm that would be happy to help you.