Losing at Zucchini...Again!

I harvested my first zucchini last week. I should have harvested about ten by now, judging by the little babies I saw, but to date I have harvested...one.
The thing is, last year was the first and only year I ever had success with zucchini, or any summer squash for that matter. And it was not give-a-ton-to-your-kicking-and-begging-for-mercy-neighbors success. It was we-have-plenty-for-our-own-use-for-once success. As in more than one zucchini success. This year I seem to be reverting to the bad old days, although I am still holding out hope.
Here is what I see on my plants one day:

 And here is what I see the next day:

 There is blossom end rot going on here! I have been valiantly fighting every pest known to squashdom too: gray squash bugs, squash beetles, cucumber beetles and Japanese beetles. Then I came down the other morning to find this:

Believe me, it actually looks better in the photo! Leaves turning yellow and sick. I had to pull out two plants that were far enough gone in an effort to isolate the other plants from the disease. Things are looking grim.
I have not entirely given up yet. There are a few small zukes that may make it to harvestable size by tomorrow or the next day. And I do have a second planting in another bed that if I can keep them healthy and bug-free may give me some summer squash in August. There are also two Trombocino squashes coming along too if they don't succumb to blossom end rot. One can only hope!