Hi Ocean,
Most of those things common called "detox" break down into one or both of these deficiencies. On each "IF" line consider if it matches your conditions. I made it very explicit separating each vartiation so a person can find an exact match if possible.
"Normal" startup with a b12 is some neurological brightening and instensification of neurological sensations.. Being very sick with it is not "normal", it is almost always one or both induced deficiencies for one or several reasons.
IF starting or adding methylb12, adenposylb12 or hydroxycbl, AND OR Metafolin (perhaps 80%)
AND the approximately 3rd day or later onset of symptoms (Detox) from Group 1 and/or group2
If I were sitting face to face and asked you "Did you just recently start or increase "methylb12, adenosylb12 or hydroxycbl, AND OR Metafolin ". That is either a yes or no answer. If is no, I would go to another such question. If it is yes I would clarify the question Did your new symptoms appear all together within a few days starting on the 3rd day or later after starting?
I hope thqat clarifies it for you.