Your husband's condition sounds pretty serious to me. I can't believe that no doctor has considered an infection at the site of surgery? The shooting pain down the legs would warn me that that is what is happening. Sounds like he had an epididymal blowout.
This is what I would suggest:
Cherry juice, fresh pineapple, and turmeric for pain and inflammation.
Aloe vera juice(with pulp is better) for inflammation and scar tissue build up.
You could apply a poultice to his "area" with either one or many of these: aloe vera, comfrey, castor oil, calendula, turmeric.
Have him take some extra vit C about 1,000 mg. every two hours for a few days(may experience some loose bowels with this) and have him drink some echinacea tea to boost his immune system.
Also, instead of aspirin or Tylenol he could take some white willow capsules which is what my husband took after the surgery.
Hope he can find some relief soon, and if not, I would seek another doctor's opinion.
PS Look on his leg for a streak. That is usually the sign of a dangerous infection.