I've had scarlet fever. It's caused by the same streptococcus bacteria as strep throat. I wouldn't call it two different things.
Good Lord! That's a wicked combo. Strep is awful by itself.
Not to my knowledge---I vaguely remember being a small child and my parents being scared I had scarlet fever, but I don't remember if I actually had it or not.
I did have a Chinese stomach virus along with strep throat and menstrual cramps all at the same time. Thought I was going to DIE.