If you're a strict vegetarian or vegan, you're at higher risk of B12 deficiency since plant-based foods don't naturally have B12
If they teach you how to give yourself the injections, your doctor would call the prescription into your pharmacy of choice for you to pick up
It is still being excavated, so there are uncleared areas
Also theres a possibility that the needle hit a larger blood vessel which has bled into the muscle thus causing pain and stiffness
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A B12 deficiency can cause demyelination, leading to neuropathy with neurological signs like numbness, pins and needles, and muscle weakness, especially in the feet and hands