I had the EXACT same problem. Still do, actually, as I employed the time tested 'ignore it and it will go away' treatment. It comes and goes. Some days it's fine, others just a slight sensitivity, others almost too painful to touch. Sometimes bilateral, sometimes unilateral. I chalk it up to a vasectomy and a possible blockage in the vas, but who knows. Post op I had a similar feeling, though that was years ago.