He's just been referred to a Paediatrician following Kidney ultrasound which was inconclusive.
These are the symptoms of a full blown attack:
Extreme (can't move) tummy pain, navel level and lower which moves and is fairly random but quite often features pain central and just below navel.
Pale skin, slightly yellow/greenish
Teeth chattering
Vomits
Urine is normal colour but is opaque, bit like lemon barley squash and when it settles in a testing pot it looks as though there is about 1.5 tablespoons of salt in the bottom.
Infection has been ruled out.