My sister told me that she has been suffering from sudden onset of pins & needles leading to heavy numb arms for a couple of months. There's no pattern to this and she has seen her GP who is not worried. The most recent occurance was on Tuesday (twice) and Wednesday (3 times) this week. She was writing at the time. It happens in both arms at the same time.
Ive suggested she see a different GP and insist on referral onto neurologist as it sound strange that both arms are affected together