My brother is 29 yrs old. He has been having pain in his lower back on the right side under his rib cage for about a year now. He also has brown urine with specs of blood in it. He went to the docs...they gave him an ultrasound, no kidney stones. They found no infection, and said he has high amounts of protein in his urine and are now sending him to a specialist. What could be the possible conditions he has and what should he avaid eating/ drinking?