I had lithotripsy last week and still have pain in the same area my stone was in.  I also have a rash on my back... does not bother me.  I am not taking anything for pain and am not passing many fragments.  I have one kidney secondary to donating one to my mother in 2008.
Hello and welcome to Chat Doctor. As a Urologist, I fully understand your concern. As your Urologist would have advised you, you must be very cautious against any problem, in the one kidney you have. Some larger fragments may cause pain, due to impaction. To prevent this, and for smooth passage of the smaller fragments, a stent is usually placed at time of ESL/ endoscopic lithography, depending on site of stone. If your pain persists, get an ultrasound scan. Chat Doctor.  You can send a copy of reports, for expert opinion here in my name.  Wish you well.