Hi, Thank you very much for your question; although it is quite hard for me to give you a precise opinion here without being able to examine you, but I would try to provide you some relevant information about your health concern. In slipped disc or disc prolapse at lumbar region, symptoms may originate due to nerve root pressure, pressure on the spinal cord and pressure on the tail bone. Common symptoms could be paralysis of muscles, pain radiating to the arms or legs, leg pain and numbness, tingling, or weakness. Warning symptoms can include loss of control of the bladder function, paralysis & spasticity of both the legs. Since you are suffering continuous weakness and notice reduced strength of muscle bulk in left leg, please arrange an appointment with a neurologist right away. Further referral to a physiotherapist for spinal exercises could be beneficial and may produce relief of symptoms. Hope this helps. Take Care & Stay Healthy!!!
I would recommend following up with a Neurologist. Yes, lumbar disk problems can cause urinary problems; you have several disks involved.
Yes, it is possible at your age to have a prostate enlarged secondary to inflammation related to an infection, but that is not the problem in your case.