I am 29 yrs old, I had PCNL for my kidney surgery 5months back.. I came to know i had stones left in both kidneys. Now i am facing problems like vomiting sensation, burning in urine passing, now totally sick and I don't know what to do. Now I am using NiFTRAN 100mg for urine infection. is this safe to use as I am having some affects like vomiting sensation, burning in when urinating, chills, etc... please advise me on this..