< The most likely reason you felt the worst on a higher protein and lower
 fat diet is IMO protein toxicity, despite of of your statement to the
 contrary. The main symptom of mild hyperammonemia is lethargy, rather than
 nausea and vomiting (which would be a more severe form, and which on this
 list seems to be identified with protein toxiciity). >

you should drop the meaningless term 'protein toxicity' and simply use
glutamate and/or ammonia toxicity.
the issue is under what circumstances these conditions arise.
one could be B6 deficiency, but there are probably many arrangements.
but a general comment, there is a big difference between
eating a lot of muscle meat, and eating a moderate amount of organ meat,
in terms of micronutrients. muscle meat is not a great source
of folate, b12, copper, selenium.  so all sorts of perturbations may arise.

andrew