Could it be that \(-\psi\) exist but is not accessible to us?
We have seen its shadow in the interaction of particles through their energy density \(\psi\), and the manifestation of heavy particle in orbit around other particle. In the former case, the forces between particle is fully accounted for by the interactions of both positive and negative \(\psi\)s from the participating particles. In the latter, \(\psi\) was made negative relative to its surrounding.
We know,
\(PE=\psi\)
and just like potential energy, \(-\psi\) is made available to us when we made ourselves of \(-\psi\).
A lower potential we fall into, a higher potential does work for us.