Is the playful banter between the questioner and his wife regarding the remaining duration of their marriage a form of waswas (obsessive whispering), or does it affect the marital relationship, and does frequent perusal of fatwas increase waswas?

Worrying thoughts are a trial that requires patience, and resisting and disliking them is a sign of sound belief and a healthy soul. Such obsessive thoughts—like those about divorce or words of disbelief—do not entail any legal rulings. They are from the stratagems of Satan. The Prophet, peace and blessings be upon him, when asked about obsessive thoughts concerning faith, said: "Praise be to Allah who reduced his (Satan's) stratagem to mere whispering."