You have every right to be worried.

At this point you are concerned and your options are to find a neurologist to evaluate you (another opinion), and perhaps do some homework on how pernicious anemia is treated.

The peripheral nervous system can regenerate. If your damage is to the spinal cord however, which occurs with very low B12 over a period of time, that may be permanent. (combined degeneration of the spinal cord is the name when this happens).

There are many sites on the net besides this one that explain pernicious anemia and its treatment:
Here is one example:
http://www.medicinenet.com/perniciou...e4.htm#treated

If yours is severe enough to cause permanent nerve damage, your injection every 10 weeks seems odd, as the typical injection protocol is once a month, after the loading dose period of frequent injections (some patients may need them more frequently). Injections are not always needed if one does high dose oral supplements, and does them correctly.