What is the diagnosis of my condition, and how do I maintain the purity of my clothes? Do I need to visit a doctor after I stopped masturbating and strange symptoms appeared in my urine, accompanied by a feeling of pleasure and the emission of a fluid similar to semen?

The fluid that often exits after urination is usually wady, which is impure (najis). It nullifies wudu' (ablution) but does not necessitate ghusl (ritual bath), unless it exits in spurts with pleasure, in which case it is mani (semen) and necessitates ghusl. As for the drops of urine remaining after cleansing (istinja'), if they are merely doubt and waswasah (whispers from Shaytan), they should be disregarded. However, if they are a certain reality, then continue to place a tissue for an hour to ensure no urine exits. It is advisable to consult a specialized doctor regarding this issue.