Absolutely. And it’s for this reason that it is recommended that anyone experiencing these symptoms take a mental health evaluation in an intelligent fashion.
Keep in mind that emulating mental illness to an outside observer is typically a major goal of gangstalking and is accomplished fairly easily within today’s hyper-connected world and with the resources available to higher-profile criminal and corrupt organizations or individuals.
It is recommended that an open conversation is conducted with someone who believes they are a victim of gangstalking without any combative or closed off approach. Regardless if the individual is sane or not, closing him/her off will result in a separation and further complicate any issues; gangstalked or not.