Thanks you for a thorough reply and willingness to help.

With regard to methyl form might causing side effects (discussed in PM), in the first week I supplemented with cyanocobolamin, and during that week nausea/lack of appetite has started.
From that moment I switched to the methyl form, and the digestive issues are still present.

I can really say that in general the tendency of my recovery is towards betterment. My mood is better, my energy is better, I had some nerve issues in my left leg over the past 1 year which I ignored and since supplementing it has improved tremendously.

The only issue that bothers me is my digestion, seems like it is regulating itself since supplementing with b12, and it shall pass soon.

I think that the main cause for my b12 deficiency is long period of stress (universify studying, and predisposition for extreme perfectionism).
I will add Jarrow b-complex to augment my recovery.
One more question please, would you combine adenosylcobolamin form as well with the methylcoblamin, for supplementation?