<s>[INST] Just had Lithotripsy done two days ago without stent . The stone was 5mm and i did collect a few pieces after that. But I am still have the worse pain at the same lower back area. Taking the Tylenol every 4 hours. Can t sit and stand too long. Just wondering how long this is going to last..and i have a low ferver 37.5-38 every evening... [/INST] It is possible that you may have another block. Also there seems to be an infection. You may need repeat investigations to confirm this. You should consult a doctor so that this can be investigated. </s>