I watched the second hit in NY. My son lives there. I prayed so hard until I heard from him via my other son who finally got through. Then I prayed for everyone else and my country. My son says that sometimes he still cringes when a plane flies over.
I can certainly understand what it must have been like for you that morning, until you knew for sure that your son was OK. I was 4 very short blocks from the WTC when it was hit and although I spoke with my dad right after the second plane hit, I couldn't reach him again until that afternoon. I sense that the hell he went through during those hours was a lot more than he told me.
About a year or so ago, I was on a LIRR train coming back into the city and when we were passing through Flushing (I take the Port Washington line), I saw a very low-flying plane and literally started hyperventilating and making squeaking/squealing noises.