Hi brother, I'm happy that you are doing the NOFAP challenge, keep up the good job! It is important to be clear that NOFAP does not cause any illnesses. If illnesses return during your NOFAP period, it is either a withdrawal symptom (often within 1 month of NOFAP) or it is a repeated symptom (caused by many factors). If symptoms return during NOFAP, be persistent and don't be bothered by it, do not PMO to "test" at all cost. 15 months is quite a long time. But recovery is a very slow process and requires patience. The speed of your recovery will depend on 2 things: 1) If you are doing no PMO 2) If you are cultivating your health Doing only 1) is not enough, even if you have been doing it for 15 months. Cultivate your health by going to bed early, exercise moderately, control your emotions, eat regularly, etc. I hope that helped brother.