No Relief, I'm sorry you're having such pain.
You mention urge to go to the bathroom - other than the urge, are you able to 'go' normally, or having trouble passing urine? Urinary tract infections don't always cause pain - I have them frequently and I'll often have the urge - just passing small amounts very frequently - with no urination pain. Where is your back pain? Over your spine, or flank? Flank pain is very common with UTI. One culture doesn't always show up an infection either - I've sometimes needed two or three samples for them to pick up the infection.
Has your doctor run any bloods? If you've got an active UTI, there should be some evidence of it in a blood test.
If you're either incontinent, or not passing any urine (the second is a medical emergency), I think this is far more suggestive of a spinal issue. If you are convinced that your back is the problem, then by all means discuss with your doctor - maybe a CT instead of MRI? These are cheaper and though not as detailed will still give an indication of whether you've damaged a disc or not. You certainly need someone to do further investigation.
All the best.
Moderator - Chronic Pain Forum
Full body CRPS with spasms, dystonia & contractures, gastroparesis, orthostatic hypotension,bradycardia/tachycardia, bursitis, CTS, osteoporosis, multiple compression fx, disc bulges.
Oxycodone ER/IR, Topamax, Mobic, Somac, Cipramil, Midodrine, Vit D & C, SCS, baclofen/bupivacaine pump