Hi If i were his treating doctor i would have suggested an ultrasound of kidney ureter and bladder. Top on my list would be cystitis which is infection of the bladder. I would have send urine for culture and sensitivity and would have started intravenous antibiotics ie cefoperazone provided that there is fever associated. I would also have suggested paracetamol for fever.cranberry juice or sachet for alkalanisation of urine iwouuld also suggest prostate specific antigen level to look for benign prostatic hypertrophy. In my opinion you should consult urologist Thanks. Wish you good health