Ocular toxoplasmosis in one eye. It?

I was diagnosed with ocular toxoplasmosis. And my vision was blurred. After medication I was able to see properly. But black spot was there in eye. And toxoplamsa Gondi left scar in my eye and went to dormant stage. Now after one year I again see thing blurry and black spot is scattered. My doctor said it is re active. I was not on medication since 10, months. Why it reoccurring again. For whole of my life will it reoccur? How can I cure it? I search on Google and found not much information regarding cure. Please suggest how to prevent it from reoccurrence. Precautions.? My doctor said in September 2017 during. Regular checkup it is dormant and in November it again active. Reason of reoccurring? Pollution in Delhi ??? Please suggest what to do ? After medication I m ok but I am afraid of its reoccurrence..