Advice

Q: I had great love for a girl and was looking forward to marrying her, however she is now married to someone else. I am really trying to forget her, but can't do so.I feel guilty and ashamed that i am thinking about another person's wife,can you please advise me and provide a wazeefa or something?

Q: If I term something as a waswasa, and I never get to know that this is a waswasa or not e.g. my wudhu did actually break but I never get to know of this. Will I be accountable for this?

Q: What du'aa can one recite in these trying times when the Middle-East and Arab world are experiencing so much of problems?