Hello. Welcome to HCM.
There can be limited causes for abnormal sensations at your age. You have locallised the sensations to few fingers which points out the probable origin in the cervical spine
.. You need to undergo an MRI
scan of the spine, which will highlight the definite cause. nevertheless, you also need a complete neurological checkup, because it is possible that other body sites may be having loss of sensation, if not pins and needles sensation. After, a neurologist
has completely noted the sensation loss or abnormal sensation, will any treatment be planned.