What is the remedy for a husband's constant feeling that everything he touches after intercourse is impure, and is this feeling correct?

The bedding does not become impure merely by intercourse, nor does anything touched by the hand become impure unless the hand is contaminated with an impurity like madhy (pre-seminal fluid) or urine and touches something wet. However, if the hand is not contaminated with an impurity, or if it is contaminated with maniy (semen), which is pure according to the more preponderant opinion, then what it touches does not become impure. Considering everything touched by the hand after intercourse as impure is an act of extremism or waswasah (whispers/obsessive thoughts) that must be disregarded.