Vegetable Garden Care

Hello, First post here, I was wondering if anyone would be able to provide me with some advice on how I can help out my garden.

I am growing squash and tomato and at first everything was great, but then after it was time for yielding fruit/veggies my squash would get blossom end rot and die before maturity. My tomatoes are taking off and are in great condition and then I did some research and got some calcium to help out the squash. Well all the started squash (pre rot) loved the calcoim and finally grew larger, but it seems the plant itself is now dying. I tried some bug spray to help and is did not work. Im worried I may have killed the plant and saved the veggies with the calcium but I was wondering if anyone may know whats going on. Throughout this whole experience the tomatos have been great, practically killing itself over how huge it has gotten.