On my way home in the taxi I felt how the swelling started. I had the antihistamine medicine in my bag but I decided I would wait a little before I would take it. I went to bed and when I woke up in the middle of the night I continued feeling the swelling, but again I wanted to rely on my natural healing abilities. Sure enough, after I went to work the next morning, I forgot all about it and the allergic reaction somehow just went away.
So it looks like we sometimes have a choice to heal ourselves without any medication. But it only works if you truly believe it. The story of my colleague gave me the confidence to give my natural healing abilities a try.