migraine after b12 injection Why do I feel worse a injection: causes explained Headaches After Vitamin B12 Shots:

Additionally, some people may experience a placebo effect, where they anticipate feeling tired after the injection and therefore do

Symptoms can develop quickly and include: feeling faint or lightheaded difficulty breathing or wheezing rapid heartbeat confusion anxiety clammy skin collapsing or losing consciousness hives swelling stomach pain, nausea, or vomiting If you or someone nearby develops these symptoms, you should: Check to see whether they have an epinephrine pen

Fatigue, lightheadedness, and low mood can reflect the calorie deficit rather than the drug itself

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