Since your B12 is normal, this prickling sensation and pain may be due to localised nerve irritation. For direct relief, over-the-counter topical treatments like lidocaine patches or capsaicin cream can help desensitise the area. If the discomfort persists, a doctor might prescribe oral medications specifically designed for nerve pain, such as gabapentin or pregabalin. It is also a good idea to have your neck and shoulder evaluated to rule out a pinched nerve. Rest assured, these symptoms are very common and highly manageable. Please consult a healthcare professional for an accurate diagnosis and tailored treatment plan.