It can be related the nerves, sharp tingling sensation
mainly in a particular position and relieved by the change in posture can be because of nerve compression in that particular posture.
Are you diabetic? There are plenty of other reasons for the compressive neuropathy, particularly the chronic diseases like hypothyroidism
, amylodosis,certain medications and toxins, and diabetes
I would advise you to consult your doctor, get the preliminary blood investigations along with xray of the spine.
You may need CT/ MRI of spine to rule out spinal canal
disorders or nerve compression.