No matter what is going on, whether it's "real" or "imaginary", it's a negative thing best to stop. Besides, the universe is full of energy, why would you want to steal someone else's yucky energy?
Practicing metta meditation frequently should help resolve the issue. http://www.accesstoinsight.org/lib/auth ... el365.html
srd wrote: It starts as an unconscious process (I can never initiate it myself), where the energy vacuum appears in my chest, but continues as a conscious process, where I choose to continue with this 'grab' of energy.
Easy then, choose not
to continue the grab. Instead generate a feeling of good will toward the person and think "may you be well, may you be happy, may you be free from suffering." Or if you don't feel comfortable directing it specifically to that person, think "may all beings be well ..." etc.