What effects could the movement of the tectonic plates have on peoples physiological well being?
At present there isn’t any known connection between the movement of tectonic plates and a person’s well being, aside from the obvious as you said. Perhaps there could be minuscule fluctuations in the local magnetic field or local gravity due to such movement, but I’m not a geologist so I’m only spouting possibilities here. Such tiny fluctuations would not have any physiological effect on people anyway. I can’t think of any other plausible connections between tectonics and human physiology.
These conditions will cause people to feel stress from fear of death. When they analyze their fear of death they will realize they are mortal and that God is real (because earthquakes and super volcanoes are in the prophecies) and many will begin to feel guilt for things they have done and how they live and a great repentance will occur. Those who have too much guilt or are not changing to repent from things they know are wrong, will of course feel stress from their guilt knowing they are not going to heaven and time to repent is running out. Stress effects our physiological well-being, causing illness and pains to manifest in many different forms and lowering our immune system’s defenses.