Hi ! good afternoon. I am Dr Shareef , a general surgeon answering your query. Your bouts of chills along with fever may be due the persisting urinary tract infection post surgery and stenting. If I would have been your treating doctor, I would have advised you for a fresh urine routine and culture sensitivity test to know the best suitable antibiotic for your UTI. I would also go for a pre and post void ultrasound abdomen to rule see the amount of residual urine and the state of kidney , ureter,bladder and prostate. If the residual urine is significant, this could be a factor for your persisting urinary infection, and to cure this, the cause has to be treated most possible being an enlarged prostate at this age of yours. You have to discuss this with your urologist, who I suppose must have taken care to look for this. Today it seems you did not have any fever as stated in your temperature recording. It seems that you have got some kind of depression post surgery, which could be normal. You have to be brave enough to counter this depression to be active again.If the depression bothers you more for a longer duration, then you may have to consult a psychiatrist. Thanks for using healthcaremagic forum for your health query. Good luck.