You are the kind of spirited nature John Lennon had in mind when he wrote the song "Imagine." The ideal world that is always just out of our reach, where all things live in harmony, is where you really want to be. Thus, you are no stranger to suffering here on earth. Emotional suffering negatively impacts your immune system, and vice versa. To "toughen up" your immune system, keep some echinacea around the house and add 8-10 drops of it to your nightly herbal tea.