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
With its preservation formulation, Bacteriostatic water 20ml solution remains stable even after it has been opened, hence, can be stored safely for 28 days before expiry
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they can be dosed on the same day without concern for absorption interference