Thanks for asking,
It seems you are suffering from a pathology in cervical spine
which is causing numbness
in your hands. Most common is Cervical Spondylosis
. I would suggest you to take a Xray of your cervical and lumbar spine
and proceed with MRI of cervical spine to see the degree of nerve compression. Discuss with your doctor.
Till that time, avoid taking pillows or use only thin pillows. Avoid driving two wheelers. Avoid sleeping or keeping your neck in particular posture. Intermittent Cervical Traction can help you temporarily, after discussing with your doctor. Sitting in right posture with frequent changing of postures while at work will help you ease the stress
on your spine. Avoid leaning or bending forward your spine even for lifting any object.