Kidney function problem. At this time.

My wife(27yrs, two children) was complaining of feeling unwell, weakness and fatigue while she was suffering from aneamea and calcium deficiency. All that happened along with prolonged period of mild fever of unknown origin after she caught and got well from high fever chicken pox for a almost a week. As she continued to feel unwell, recently we saw an MD who then diagnosed her with higher than normal level of s. urea and s. creatinine in blood and told us that her kidney is not functioning as normal and it's kind of a serious problem. She had urine infection but urine culture was ok. He advised some medicine of kidney, urine infection along with iron but asked not to take calcium tablets. Consequently the s. Creatinine level came down to almost normal within two weeks, then calcium was advised only to raise the creatinine level in her blood to our worry. The whole family is now worried about her kidney disfunction and we're wondering what can be done to her recovery at this time.