Nobody seems to be answering your questions so here goes:
Needless to say your symptoms could be caused by hundreds of things, some of which are Earth Energies, some man-made.
Did the energy you dowsed show up for you before or after dark? Did you try tracking down some possible source within the dwelling, like an electrical service box?
Are you able to be selective in what you dowse for? If so, you might try asking to detect only electrical phenomena ("stray voltage", magnetic hot-spots, high-frequency standing waves, etc.), only geopathic earth energies, etc. I work from a list http://www.geopathfinder.com/WebDocuments/EnergyCharacterHarmful.pdf
and just keep asking questions, although this may not work for everyone.
"Develop an infallible technique, then place yourself at the mercy of inspiration." (from a craftsman, but it applies widely)