My three year old has been having a rash that seems to come and go that is behind the ears and in her hairline on her neck. She is also randomly vomiting a very small amount about once a day at random times. Along with the rash and the vomit she has gone from her usual nap of one hour tops to 2-3 hour naps. She will also complain that her belly hurts, her lower back hurts and neck hurts. Any ideas what this could possibly be?