3 months rt side sciatica, past week has spread to lft side, feet going numb, and random feelings of almost stumulation of genital area! what's happening?

Several things : Possibly going on including the possibility of a disc herniation compressing a large part of the nerves in the back that could be causing what is called a cauda equina syndrome which should be evaluated immediately &requires emergent surgery. Other possibilities could be in the diagnosis but you should go to your doctor or er immediately especially if noting any bladder or bowel issues.

Nerves in back: The history is suggestive of symptoms of compression of the nerves of the lower spinal canal; however, other conditions can mimic this. A visit to a neurologist, neurosurgeon or spine surgeon would be prudent.

Symptom Vs Cause: Sciatica is the symptom of leg pain caused by a disc herniation or narrowing where the nerve exits the spine. A disc herniation is a outpouching of the disc from its normal place into the spinal canal or on the nerve and can be a source of pain in the back or down the leg and in your case groin area . The nerve then goes to the muscle which can then hurt, spasm or feel sore or irritated.