We have also had blossom-end rot on our tomatoes this year. I am going to sent The Husband the link to this post. We put all our eggshells into the compost and I can't remember whether this bed was prepared with our compost or manure that we bought in. So glad your tomatoes have recovered, @lizziesworld
I grind my egg shells into powder to help the break down but as mine are in containers, I am now aware of nutrients being leached out of the soil with watering - all looking good so far.