Hi! There is a chance that you have compression of the spinal nerves in the lumbo-sacral spine region. This can happen due to overuse of the lower back as in work requiring too much of bending, lifting weight, fall on the back, overweight, canal stenosis, bone disease, spondylosis, poor posture etc. A MRI of the spine will be definitely required and nerve conduction studies may also be needed. The treatment is to remove the compression. You have to discuss the best treatment option with a neurologist, which can range from medication to physiotherapy to traction, lumbar belts, lumbar corsets or even surgery.
Another possibility is like saddle neuralgia or Pudendal nerve entrapment (PNE) in which the pudendal nerve (located in the pelvis) is entrapped or compressed. Pain is worsened by sitting, and there is a sense of a foreign object (constant urge to urinate) in the urethra. Prostatitis-like urogenital pain is the hallmark of pudendal neuropathy. Diagnosis is by diagnostic block, MRI, CT scan, and Pudendal Nerve Motor Latency Test (PNMLT).
Hope this helps. Take care!
thank you so much for taking the time to reply it means alot. we have just had a uroligist appointment and have also ruled that out. now its off to the neurologist. fingers crossed!!