Name changed for this. DS (16) usually fit and healthy feeling really, really tired and lost 3.5 kilos in a six week period . Stomach pain too in lower abdominal area. GP says blood tests showing concerns around liver and kidney function so ordering more blood tests immediately. I can’t remember if she mentioned enzymes but also suggested it could be a virus. Anyone got any similar stories with positive outcomes? GP also mentioned celiac disease but DS has had no bowel changes. Diabetes tested for and ruled out.