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This does not appear to be typical features of Multiple myeloma
. Has a blood peripheral smear been done to rule out this condition. All values seem intact other than the liver enzymes. The leucocyte esterase test is to look for the presence of infection in the urine as in gonorrhoea and also sometimes spontaneous bacterial peritonitis
. The problem could be due to vitamin absorption due to possible liver and/or gall bladder disease
and I suggest you get an ultrasound
to rule out pathology in these regions. A disease in these areas can also cause a similar picture including sharp stomach aches under the ribs. It could be a case of gall stones
as well. Let your children stay away from oily or fatty diet at all costs and eat diet rich in fresh fruits and green leafy vegetables. Drink plenty of water. Do get a Psych consult as well as many psychiatric conditions can produce such symptoms with no clinically detectable problem as well.