Those are really high doses of B12. HAve you done a methylation pathways panel? If you have any methylation blocks, doses that high could trigger detoxification, and that definitely could whack your brain out. Also, you probably want to see if you have a CBS snip and if so, clear that FIRST, before diving into all that B12.
Regarding magnesium: Back in 2007, Carolyn Dean (MD, ND) wrote a book called The Magnesium Miracle. (She is an expert on that topic.) At that point she found magnesium glycinate to be the best form of magnesium to take. But in a recent paper, she has changed to
ANGSTROM MAGNESIUM.... which I have never tried. You can read about it starting on page 20.
http://www.utahsportsandwellness.com/pdfs/ChangeMagnesium.pdf
I am curious if anyone here has taken angstrom minerals, and how they worked for them?
The rest of the stuff you are taking.... I have no clue about how it would be affecting you.