Does a detoxification mimic all the symptoms of a serious kidney infection?

No. A host of sweet-talking, convincing, unscrupulous practitioners offer a great variety of "dexofication" treatments to people worried about their health. Dr. Weeks is absolutely right -- if you have these symptoms, get right to a reality-based physician. If an "alternative practitioner" urged you to neglect a real kidney infection, call your district attorney.
Probably not. I'm not sure what you mean by detoxification, but having burning with urination, blood in the urine, fever and/or pain under your lower ribs could be a kidney infection. Get a urine test by your doctor.