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If you have had a lot of rain, at best it is that the nutrients were washed out of the soil and the fertilizer will help. But it might also be early blight, which flourishes in rainy weather. Give them some time to see if they perk up after being fertilized, but just in case, here is info on early blight:
https://www.gardeningknowhow.com/edible/vegetables/tomato/early-blight-alternaria-tomato-leaf-spots-yellow-leaves.htm

This is called cracking. Cracking occurs as the tomato nears maturity. Plants have periods where they might have very fast growth followed by slow growth and then fast again. These changes can cause fruit nearing maturation to crack. Wide fluctuations in temperature and moisture levels can also induce cracking. Maintaining a proper water management and regular fertilizer regimen should alleviate the problem, though it is inevitable nonetheless. Here is more information: https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-cracking.htm

This article should help you with your tomato problem: https://www.gardeningknowhow.com/edible/vegetables/tomato/yellow-tomato-leaves.htm

This link will help you.

https://www.gardeningknowhow.com/edible/vegetables/tomato/growing-indoor-tomatoes.htm

It could be early blight. This article can help you determine if the plants have other signs of this:
https://www.gardeningknowhow.com/edible/vegetables/tomato/early-blight-alternaria-tomato-leaf-spots-yellow-leaves.htm

It sounds like you may have blossom end rot. Larger tomatoes are more susceptible due to the nature of the disease. Here is more information:
https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-blossom-rot.htm