Let me know the outcome. I have lived in a mobile home since 1980. In the past year, I have experienced a sore mouth and a worn-out feeling. No one know the prevalence of formaldehyde poisoning caused by fumes released from insulating material. It does happen, without doubt.
Some people appear to be unusually sensitive to formaldehyde vapor.
If your house contains formaldehyde insulation, representatives from the state health department can use special sensors to determine if the fumes are present in high enough concentration to cause symptoms. However, your sore mouth and loss of stamina are probably due to other factors. Before calling the health department, see your doctor for a complete examination and blood tests.