Good luck at the doctor. Hope you start feeling better! Yes, the Cyano B12 is really not needed. Doctors really should know this, but some do not.

I take Methyl. B12. I used to get shots because my level was SO low, then it was fine so I take it sublingually. Works great!

I have to be very careful with B6. Too little is bad but too much is bad for the nerves also. I always get tingling that lets me know. It is added to a couple of supplements but I never take it alone.