I am due to transit for a day in the US on my way to Haiti next month. Reading all the comments on this board and the press I am now getting nervous that US imigration will give me a grilling as I have several visas in my passport from countires which the US consider terrorist hotspots (Iran, Yemen).

Would it be better for me to replace my passport (it is nearly full so I would probably be replacing it in the next few months anyway), or am I worrying about nothing?