Will I experience the side effects listed on the internet for cortisone (prednisone) if it's only for 5 days?

It is unlikely that you will experience the side effects typically associated with cortisone (prednisone) when taking it for only 5 days. These side effects usually occur with high doses over a prolonged period of time, or when abruptly stopping the medication. Short-term and occasional use, such as in your case, is less likely to cause these side effects. Additionally, taking cortisone in nasal spray or inhaler form reduces the risk of certain side effects like diabetes and high blood pressure.