Hello, 
Thanks for the query to H.C.M. Forum. 
Extra pulmonary tuberculosis , if not treated well or  incomplete treatment reoccurs . 
As you are complaining the right testis is bigger and hurts specially when you walk , so I want to tell you that normally the size of right testis is somewhat bigger than left  so need not to worry . 
2nd question is right leg hurts, but you have not mentioned the site of pain so difficult to evaluate diagnosis. 
The main cause of concern is pain in the LEFT kidney , may be ,
1 Tuberculosis , diagnosis can be confirmed by blood examination for C B C , E S R ( if very high chances are of tuberculosis), MRI , also blood examination for 
serum CREATININE level for kidney function. Then 
consult a nephrologist and get his opinion. 
2 Renal stone , diagnosis can be confirmed by ultrasound so for go for this. 
3 
Renal infection ,  get in urine culture and sensitivity test and 
consult a urologist after this . 
As already one kidney removed so at  present consult a Nephrologist at once and get his opinion. 
Good luck. Dr. HET