Fortunately you cannot "overdose" on B12 as any excess is excreted via your urine so I would suggest you continue with the tablets until there is no further improvement and then take a "maintenance " dose every now and again but for "ever".
As to the anaemia try to eat iron rich vegetables like spinach, silverbeet and broccoli.
lentils and beans.
nuts and seeds.
grains, for example whole wheat, brown rice and fortified breakfast cereals.
dried fruit.
As long as you don't have an absorption problem with your digestive system your Foalte level should be, as you say. OK but the point of my "silly question" was that a Folate deficiency can result in similar symptoms that can include:
symptoms related to anaemia
reduced sense of taste
diarrhoea
numbness and tingling in the feet and hands
muscle weakness
depression
Folic acid works closely with vitamin B12 in making red blood cells and helps iron function properly in the body. There is a complex interaction between folic acid, vitamin B12 and iron. A deficiency of one may be "masked" by excess of another so the three must always be in balance.
It is not uncommon for some symptoms to appear to get worse before they get better as the B12 starts repairing the damage done to your nervous system and your brain starts getting multiple messages from part of the body it had "forgotten about" or lost contact with.
I sometimes liken it to a badly tuned radio on which you have turned the volume up high trying to catch the programme you want when all of a sudden the signal comes in loud and clear and the blast nearly deafens you.
A lot will depend on the severity and longevity of your B12 deficiency as to how long before there is no further improvement or recovery. Some symptoms will "disappear" quite quickly whereas others may take months or even years. There is no set timescale as we are all different.
If you are raising your child to be vegan then you must bare in mind that your toddler will also be at risk of developing a B12 deficiency, if not already, as one of the risks listed is "Infants born to and/or breast fed by women who are symptomatic or are at risk for B12 deficiency."
I wish you both well - goodnight.