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Hello and welcome to JA. Dr Saleem here, happy to share my opinion.
What do you exactly mean by chill? Is it like a current or like burning sensation? Any pain in neck/ shoulders?
If you have been having such sensations in both arms then it can be something related to your nerves. They originate from your neck from the inter vertebral spaces and supply both arms . With aging these vertebrae like all other bones degenerate and the space between them becomes lesser and lesser. This inturn causes compression of nerves leading to these symptoms you have been experiencing.
Donepezil may sometimes cause muscle aches and stiffness too.
You are likely to benefit from following
1 .Vit D and Calcium supplements
2. Vit B12
3. Tablet pregabalin or gabapentin
An x-ray cervical spine will help clear the state of your neck vertebrae.