IntraVesical blader instillation

Hi all.

I had prostatectomy in March 21 followed by radiotherapy in dec 21.

So far so good, 5 years on my PSA is bellow 0.025

My issues is painful bladder when full.  Frequency and amount of urine passed is minimal.

I am now having IntraVesical blader instillation with IALURIL.   

Nurse says that there should not be any side effects except may be urine infection.

But I am feeling pain in my groins and some tingling in my legs!!!!  

So just wondering if any one else here has any experience of this treatment ?

Thanks.  Berni.