What is the ruling on some cases that resemble obsessive doubts (waswasah), such as the feeling of urine drops coming out after showering without certainty, and the doubt about the impurity of bedding and clothes after urine drops have fallen without being able to determine their location, and how to purify them? And what is the ruling on purification with water from public suspended toilets?

You have reached a significant level of whisperings (waswās), so we advise you to turn away from these whisperings and not pay attention to them. If you doubt the emission of urine, do not pay attention to the doubt until you achieve absolute certainty. If you doubt that impurity has touched your clothes or bed, the default is that it has not touched them unless you are certain otherwise. Do not pay attention to doubts about urine drops coming out after ghusl (ritual bath). If you doubt that impurity has reached your clothes, the default is that it has not reached them. Even if your clothes were to become impure, the impurity does not transfer to the bed or seats. There is no harm in performing istinjā’ (cleaning after urinating/defecating) in the mentioned places, and the water prepared for istinjā’ is pure and removes impurity. Completely abandon these whisperings.