--and do you think I should cool it with my 225mg/day magnesium citrate for a while (which has kept me "soft and regular" for years, in addition to being good for cramping), at least until the gastrointestinal issues improve?

The more I think about it, the more I think I've got something going on in the upper maxillary sinus area, predominantly right side (I do have a deviated septum) that's going to need some intervention (I even now have a bit of bruising under my eyes, along the top of both cheekbones, though more right than left--a thin, maybe 2mm, discoloration about half an inch in horizontal dimension across the upper bone below the eye--looks like someone drew it on with a dull pencil. Weird.)