Many people experience sensations of lightheadness or actually faint when receiving a needle injection or being exposed to stimuli associated with blood or invasive medical procedures. This is typically caused by an automatic reflex known as vasovagal syncope.
Applied tension is a simple set of procedures that a person can use to prevent this from happening. It is described in the following resource:
Chapter 6 (pages 100-113) of the following book that is available free online: Antony, M. M., & Watling, M. (2006). Overcoming Medical Phobias: How to Conquer Fear of Blood, Needles, Doctors, and Dentists. The complete book is available as a PDF on Dr. Martin Antony's website for free. It also may be available on Amazon.Â