I'm sorry to hear about your sun poisoning. I'm not sure I understand what it is. I had a smidgeon of heat stroke once camping out in Utah. But, not the same thing, I imagine.
I can see you are very fair and have lovely skin. I wouldn't be pushing it out in the sun, especially if you're sensitive. They've got 70 proof sunblock now!
I don't know that the number matters. Just slather it on and protect that fair skin.
Your kids look fair too. How do they hold up in the sun? I had second degree burns all over my face, back, neck, chest, arms swimming at a pool all day when I was in third grade. My legs were the only things that didn't "crisp" up because they were always under water.
My blisters were the size of walnuts.
Very painful, yet vivid memory. :shock:
Take care of yourself.