This is most likely due to the pinched nerves in the neck which are giving you these significant symptoms. This can be due to;
1) Herniated/degenerated disc in the neck
2) Cervical spondylosis; bone spurs in the neck vertebrae pressing on the nerves.
Following investigations would be required;
1) X-ray of the neck spine
2) MRI of the neck
3) Nerve conduction velocity (NCV) study
4) Electromyography (EMG)
Following measures would be helpful;
1) Neck care in the activities of daily living.
a) No working on the computer for more than half an hour in a single stretch. Same for TV.
b) Monitors and televisions exactly in front (180 degrees).
c) Contour pillow: Should fill the hollow when lying on back or straight. Available over the counter.
2) Cervical Collar or Brace
3) Cervical traction
4) Anti-inflammatory analgesics like Ibuprofen
5) Some physicians do give oral steroids in severe radiculopathy cases, in which pain/numbness/tingling is quite significant.
6) Physical therapy: gradually increasing exercises from passive stretching to active against resistance regime.
7) Electrotherapy in the form of TENS, interferential and laser, and ultrasound.
8) Hot fomentation
9) Local analgesic patch / ointment / spray
You can consult the following specialists;
c) MD in Physical medicine and rehabilitation
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I wish your symptoms resolve soon.