Thank You, I guess the subconscious is a mysterious thing.
Hi
The first time it was the effect of cortisone injection. The next time probably your mind was subconsciously expecting the reactions. Hence though you did not have dry hot flushed face, the nervousness set in. It is natural that since once you had a reaction, you are scared.
However there is a difference, the first was not an immunization, whereas the second one was. Generally these are tested, approved and then used. Reactions do happen once a while, but one should move on. Always it will not happen.
However it is difficult to diagnose without examining. Next time in case you have such a reaction, please consult a doctor immediately, who can examine you then.
Hope this helps. Please let me know if there is any thing else and keep me posted.