How does one purify himself if he feels two drops of urine exiting after urinating, while constantly suffering from obsessive doubts and suspicions about that?

Worrying thoughts (Waswasah) are among the most dangerous ailments, so you must turn away from them. If you doubt that anything urine has exited after finishing, do not investigate, and build upon theception that nothing has exited. You can sprinkle your trousers with water to ward off these intrusive thoughts. However, if you are certain that urine has exited, then you must perform Istinja (washing private parts), purify whatever it touched, and perform Wudu (ablution). We have already explained what is legislated for one who habitually experiences drops of urine after urinating.