You have what is known as RSI(Repetitive Strain Injury
) due to your computer usage. In all probability you would be having Cervical Spondylosis
coupled with maybe Thoracic Outlet Syndrome
which can be confirmed by a neck X-ray. My best advise to you is to limit the usage of computers for 20 minutes and take a break for about 20 seconds walking up 20 steps away from your computer and looking about 20 feet away for those 20 seconds and then go back again to the computer. With this you can prevent lot of RSI due to computers. For a start you can have Cervical Physiotherapy
fro about 6 to 8 days which would definitely give you relief.