Hello and welcome to HCM,
You have mentioned that you are having burning urination.
The urine culture report was negative,
report showed large amount of urine in the bladder.
This residual urine may be due to obstruction at the outflow region of the bladder.
this obstruction may be due to enlargement of the prostate
The pain in the left testicle may traumatic or just psychological.
Please refer to your doctor for further investigations to ascertain the cause of residual urine in the bladder and the pain in the testicle.
Thanks and take care.
Dr Shailja P Wahal