The electric current like sensations as mentioned in your post are Neurological in nature.
It can be due to:
1. Para-spinal muscle spasm
or compression of nerve fibers due to incorrect posture.
2. Entrapment of nerve fibers at the Axillary region.
3. Dietary deficiencies of certain nutrients like Iron, Calcium, Vitamin D, Vitamin B 12, Folic acid, etc. which help in blood formation & nerve conduction.
4. Peripheral neuropathy
secondary to any fluctuation in blood pressure or blood sugar levels.
Symptomatic relief can be obtained by intake of nervigenic agents (like Vitamin B6, Vitamin B 12, Folic acid) as well as multivitamin & multimineral supplements including iron, calcium & Vitamin D needs to be added in your diet.Physiotherapy
& postural exercise will also be helpful.
If symptoms still persist, kindly consult a Neurologist
& get a complete Neurological examination done.
Certain investigations like complete blood count
, serum electrolyte estimation, fresh estimation of blood pressure & blood sugar levels & nerve conduction studies will be helpful to rule out any pathological cause for the symptoms.
Wishing you a Good Health.