I have been relatively well until recently. I had severe allergies as a toddler, chicken pox when I was eleven years old, but other than that my fainting spells when I hurt myself were the worst I had to deal with as a child. Now, I would definitely rate anaphylaxis as the worst. It's so sudden and it takes so long to recover. And it's anaphylaxis for crying out loud.
Thinking about how well I have been for most of my life, I count my blessings. Many people have such struggles with their health, but I have had it very good for a very long time. I am grateful.