Always good to have a reason I have also had this happen when my folate was low , it may be worth you getting it checked I had self inject my B12 every 4 weeks for the last 20+ (cannot really remember how long accurately), and 2 months ago got a similar 'electric shock tingling' all over my body - head, face, arms, hands, legs, feet etc within a couple of minutes of injecting, which lasted about 3 seconds or so
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And the position of the Pernicious Anaemia Society has always been that PA is more than just B12 deficiency
From there, your cells use B12 to support energy metabolism, specifically by helping convert carbohydrates and fats into usable fuel