That's a confused and partial understanding.
That's a good question. The answer is a question of scale and range. We have thoroughly explored, in theory and by experiment, physics at the everyday scale of human interactions. The world and our bodies and brains are made of protons, neutrons and electrons, influenced by electromagnetism. The only other force that might be considered relevant at these scales is gravity, which is very weak and acts on us uniformly.
There may be unknown particles, fields, and forces at scales we haven't been able to thoroughly explore, such as the subatomic scale or the cosmological scale (e.g. dark energy, dark matter), but they are not relevant to everyday human scales. Their ranges of action are either too small (subatomic) or too large (cosmological), or they are too weak to significantly influence us. Yes, we can be damaged by non-electromagnetic radiation, etc., but it's not an everyday concern.
So we now know the basic rules of nature at the human-scale. If there was anything else that could significantly affect the protons, neutrons and electrons (and so, the atoms, molecules, and cells) we're made of, we'd know about it. Anything that influences our bodies & brains must interact with them. Electromagnetism is the only force that is relevant at these scales and we're swamped in electromagnetic radiation, from electric wiring, radio, wifi, light, microwaves, etc., and it has negligible effect - our skulls are good protection and we're not particularly sensitive to it (but don't put your head in a microwave oven).
There are no other fields or forces that can significantly interact with our brains, so disembodied consciousness is a non-starter, even before we consider all the baggage of thermodynamic impracticalities, interaction problems, problems of origin and evolution, accompanying such a speculation.
They do show how adaptable the brain is, even in adulthood. Nevertheless, damage to the areas concerned in generating sense of self is known to produce abnormal self-image, etc.