There is a good bit of speculation and partially observable facts on this one - specifically about the very small influencers.
The schools of thought are generally artificial mechanical or primordial biological.
Primordial Biological: The anon who keeps talking about not eating meat, using very stilted, kind of uncomfortable (for me at least, I'm not able to judge efficacy because it got my attention) language, is suggesting there is a link between what we eat and our manipulability. This mode of thinking holds that 'stuff' besides nutrients comes along for the ride into our biological systems. This makes some sense given rumors of ancient beliefs that 'you are what you eat' and the very messed up practice of eating parts of your enemies to gain the strengths of these parts. A more scientific, if still relatively uncomfortable, view would be found in David Icke's ideas about how the Archons are used by (or use) the Annunaki to influence people. https://en.m.wikipedia.org/wiki/David_Icke
The ideas of bacteria, viruses, and prions are likely fairly good ways of viewing the biological mechanics of hijacking a person. Prion means proteinaceous infectious particle - which is basically something that we don't understand which causes proteins to behave incorrectly in the brain.
Artificial Mechanical:. Of course, the Pleiadien channels by Barbara Marciniak speak of the abuse of computing technologies at ever decreasing size scales to improve governmental control over populations as being fairly widespread throughout this galaxy at least with very large battles being waged to free systems and people. The effects would be largely the same as the Primordial Biological mentioned above but they would be centralized control AI systems. Assange reports use of 'evil smart dust' as part of a governmental control system, like a drone swarm, only so small they can be integrated into the nervous or respiratory system.
https://youtu.be/L0ZUMprfSO8
Because my own thoughts haven't coalesced around one of these systems of belief as of yet, I'm still noodling around in the dark with ideas of multiple frequencies, chakras, directed thought and energy, cording, and a system made up of humans and technology for interacting with and recording or studying the target (i.e. me).
I'm sorry for your experience and your mother's experience. I cannot give medical advice and I wouldn't accept medical advice from an anonymous free speech platform either. It would probably be wise to stay on medication as prescribed until I fully understand what is going on. Please remember that Jung, the scientist, actually thought he was slipping into psychosis before he realized that the universe is a little less deterministic and a little more meaningfully acausally connected than he thought. My only advice is to say that when you're feeling acted upon psychically, any 'attacker' has to 'place' a projection in your construct in order to create any effect in your mind. Since you have physical access to the hardware (your mind/body) you can modify that projection, and maintain control over the projection.
(Incidentally, I appreciate how non-judgement the anons seem to be about all kinds of stuff but, psychotropic drugs may prevent one from consciously modifying the projections experienced meaning that the experience may be much worse or much better than your physical system can handle - in short, the above is my counter illegal drug statement).
Whether the projection is a figment of imagination or coming from an external source (biological or artificial or energetic), realizing that everything works both ways will go a long way to protecting yourself and going on the offensive. Just remember the lessons of Ged of Earthsea as you are planning any offensive: if you can't beat it, hugging it may help.
https://en.m.wikipedia.org/wiki/A_Wizard_of_Earthsea
That's all I got.