It is very rare, but possible to develop PCO a second time, requiring a second yag procedure on the same eye. See any opthamologist to diagnose.
Having a blurry vision after a surgery will be associated with dry eye syndrome, posterior capsular opacification, problems relating to the pupil size, a decentered IOL and many other conditions. The effective treatments include keratorefractive surgery for ametropia, dry eye management, laser modification of the pupil size, YAG capsulotomy for PCO or an IOL exchange for issues intrinsic to the IOL.
I had an iol and YAG. For a few days afterwards I saw halos, but these were gone after a week. Then I began to see a kind of foggiines. Turned out to be serious inflammation caused by old cataract debris that got into the vitreous during the YAG. In the end, I had to have a vitrectomy to replace the contaminated vitreous. Now my vision is fine, all I see are some floaters.
I obviously don't kmow your case, and I'm not a doctor, but hopefully my experience will give you one possibility to discuss with your eye specialist.