Hey Rene, at Melly Lane's request, i'm gonna take a stab at this. Her heart, as does mine, goes out to your mom blowing 5 bills - lame. >>frowns>>
Is her pee dark or clear? Was the $500 spent on tests? If so, what were the results? Given the symptoms you mentioned, it could be any number of things. They should've given her a pee test to check for the presence of blood and albumin. Get the test results if they exist, and post them.
Time for a new internet abbreviation, you saw it here first - TLI - too little information. This is a site -wide plague, please don't take it personal. What's her diet like? Does she push papers at work, or is she physically active? What meds did they give her? Sorry about all the questions. If it was you, i could get a profile by digging into your posting history.
Low magnesium levels make nearly every disease worse, and if you suspect blockage well, i'd start downing cayenne or red clover or alfalfa or chamomile [all are good sources of mag.] or maybe i'd go get some magnesium pills - can't hurt. If there's fluoride in the tap water then she's gotta stop drinking it. It'll just make things worse. If there is and she won't, then there's no way anything anyone suggests here is going to help. It'll be like trying to dry off in the shower. Get her to start drinking distilled water until she figures it out.