Also known asnegative earth energyharmful radiationspace stress
Before construction, spread lime dissolved in water over the entire land below the flooring. Given as a brahmastra and one of the sanskars of land, it nullifies geopathic negative energy.
Entire plot, below the lowest floor
There are two energies: geopathic energy from within the earth, which gives growth, and cosmic energy from the air, which supports it. The ground energy reaches every floor, as a building rests on its foundation, so check the ground floor and basement energy first; the cosmic energy can differ from floor to floor with orientation, as was found in a 17-floor building. Basement energy matters most, just as fertiliser and water go into the soil, not onto the leaves.
It indicates negative energy at that place. Dowsers and highly sensitive persons feel such energy much more strongly, and your body was able to sense it; talking about it connects you to it again. The teacher has had similar reactions at sites, once with his whole body going limp, red and sweating and with severe loose motions.
Protection methods are taught in later classes. Even with protection, very strong negative energy will make the body react while you are there, just as wind touches you whatever shield you make, but with a protective shield (suraksha kavach) it cannot do more than that reaction.
It is a dosh, not a vedh. Stairs carry the geopathic currents from below up the building; a current moving clockwise grows while one moving anti-clockwise is lost, just as spinning clockwise and anti-clockwise feel very different.