I don't understand how an extra lumbar vertebra would work, how it would interfere with the lumbar nerves that innervate the bladder or penis, and why you have pain.
Accepting "I have an extra lumbar vertebra, therefore I have pain and other symptoms" is an unsatisfactory explanation.
I would recommend that you see a spine specialist who can order an MRI or CT Scan film for greater detail, a diagnosis, and provide you with a better understanding of your problem.
You are only "doomed" for as long as you remain ignorant of your medical problem. The moment you begin to take responsibility for understanding this condition and finding a treatment, you begin to have hope.
Begin by studying normal lumbar anatomy and learning how it functions so that you will be prepared to assimilate new information about your extra vertebra.