Prominent node (in right lumbar region)

Hello Dr. I suffering from fever and dry cough more than twenty days. Date 22-05-2018 I admitted nearby civil Hospital. From there doctors diagnosed and take all of samples related with problem. In every report there is normal. Negative maleria, Negative HIV, Negative sputum ,bilirubin 0.24 mg/dl,hb 10 ,tlc 4200 doc 5938127. But ESR 105, they give me an antibiotic and zenta injection through drip for six days of my admission. And done an ultrasound of whole abdomen. In ultrasound there is a prominent node in the right lumbar region. But other organs of my abdomen is normal. The surgeon says there is nothing to worry about. And discharged on 27-05-2018 evening. Give me medicine for five days course. Now the problem is that I have pain in My ribs and always feel tired and sick. What should I have to do. Plz suggest me.