Does the localized sticking of the glans' lips or the presence of a viscous substance inside the urethra after they open necessitate washing or changing the underwear? And does prolonging the act of blowing the nose due to obsessive-compulsive disorder affect one's health and psychological well-being?

What you are suffering from, in terms of obsessive thoughts, is caused by dwelling on them. The cure for this is to turn away from them and pay them no mind. If something like madhy (pre-seminal fluid) or urine exits, and you are not certain that it has reached your clothes, the original state of the clothes is purity. It is sufficient to wash the spot of certain impurity. Madhy is purified by sprinkling water. After relieving yourself, perform istinja (definition) (cleansing after defecation/urination) in a normal manner and do not exaggerate. The predominance of your belief in purity is sufficient. Then go about your business and do not pay attention to the obsessive thoughts.