Originally Posted by QF009
What would you suggest I do in my circumstance? I definitely cannot legally say that I've not been to the US...
I would estimate the dates of your visit as best you can and make a note to that effect. Err on the side of thoroughness.
And I'm entering the country at ORD, is customs there harsh?
Depends. I've only had my bag searched once, when my form indicated that I'd been to Bolivia. Most of the time they just say "welcome home" to me but I think treatment really varies depending on US citizenship or lack thereof.