Re: It must be spent
A suitably tuned aerial would presumably do the trick. One can reasonably say that it absorbs radiation at the offending frequencies from the environment (and sinks the energy into a resistor). If we are talking about the frequencies used by modern gizmos, the "EM sponge" would be fairly small and therefore wearable.
Psychiatric treatment would consist of demonstrating said equipment in a proper lab and proving that it actually works. Then you sit back and let the placebo effect work its magic.