Hi Jenisis,
I'm one who doesn't get any rashes from the sun. I'm a redhead too! So I"m extra sensitive. But for me, I know I've had too much sun when I just feel crappy. I get that flu type feeling, really tired, no energy. I use lots of sunscreen and apply it often so I won't burn. I'm a wedding photographer. I was out in the sun for an outdoor ceremony and the formals after this past Saturday. I definitely felt the effects of that the next day. No rashes or sunburn, but I felt like poop. So the symptoms are different for everyone.
Ginny