BER - Where do I begin?

[PastorJeff]

I'm growing six tomato plants in 3 Earthtainers. Two Parks Whoppers, two Celebrities, and two Better Boys.

Just as the tomatoes are starting to look promising, I've discovered what I assume to be blossom end rot on several tomatoes in each container! What I find is either a green or ripening tomato that has a large dark-brown spot on the blossom end.

As far as I know I followed instructions precisely when building and filling the containers. I added the lime as instructed. I'm using an AWS, and live in central New Jersey, where tomato picking time should be only a week or two away.

I'm freaking out!

What should my first steps be to stop this from spreading? What causes it? And, are the non-rotten parts of the BER tomatoes edible?

These are the strongest, healthiest looking tomato plants I've ever had, and I've made a huge investment in time and money to get this far. Plus, my reputation is on the line among all the people I've been bragging to. (Ok -- I get it -- Pride goes before a fall.

Please help me salvage this harvest !

-Jeff