I just spoke to the Urology Nurse about the side effects. Yes, that is what you should expect - crikey. If it goes on longer than it did then you need to worry - they reckon no more than 24 hours. At present then, the Ibuprofen and paracetamol were a good move and the treatment is designed to remove the lining of your bladder!
I think it certainly did that for me. I'll probably not try and get up and go back to work after the turning bit next time.