How Long Does a B12 Shot Last? LiveVibrant Wellness Guide Still feeling tired even after good sleep? It might be more than just stress it could be Vitamin B12 deficiency., In Part 2, Dr. Pydi Satish, Consultant General Physician, explains the signs, causes, Vitamin B12 injections Dr Aesthetic Medicine Here's a scenario that happens more than we'd like to admit: a patient on metformin for years comes in reporting tingling in their feet. You work them up for diabetic peripheral neuropathy, For anyone that has had to do vitamin b12 injections.. do they give you nausea, diarrhea, and a bad headache? I did my first injection this afternoon and a few hours later