What Causes Sudden Stabbing Pelvic Pain, Tingling Sensation Throughout Body And Numbness?

I had an IV iron infusion 6 weeks ago. I initially had muscle aching, then after 3 weeks I had a sudden stabbing pain in the pelvis, followed by sacral pain, difficulty walking, extreme weakness and numbness, tingling and strange sensations all over. The pain subsided after 2 weeks. But the neurological symptoms and weakness persisted. After testing with MRI, EMG and Lumbar puncture, the major neurological have been ruled out. We believe the condition is a reaction to the IV iron. Has anyone else reported these symptoms? Just wondering how long the weakness will last and what I can do to help myself?