Immunisation and Vaccination are two words for the same thing; essentially adding a part of a bacteria, or a whole ‘dead’ bacteria to our system, so that our immune system is prepared for us contracting the illness. We actually use the term ‘vaccination’ because the cowpox virus used by Edward Jenner as a preventative treatment for small pox is called vaccinia.

There are many possible reasons, but it may be that your nervous system goes into overdrive when you’re nervous. This causes your sympathetic nervous system, the flight or flight mechanism, to kick in. This can cause an increase in blood pressure, which then inspires your kidneys to produce more urine, to try to reduce the volume of blood.