Why does neck shoulders and back feel like pins and needles?

I've been lifting Recall boxes filled with Codafiles full of paper for my job since August last year.

On and off I've had neck, back shoulder pain, this is the worst it's been.

The bacl left side of my neck feels like it's been stabbed with a knife and my back feels like pins and needles and I'm all shaky like I'm out in the cold.

It's just come on this afternoon.

I have a scar on my left back shoulder from a heart operation I had in the 80s when I was young.

The last time I had the stabbing shoulder pain was a few months ago.

I'm 40, but I don't think it's MS.

Why does neck shoulders and back feel like pins and needles?
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