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This article should help with the yellowing leaves: https://www.gardeningknowhow.com/edible/vegetables/tomato/yellow-tomato-leaves.htm

It sounds like your plants have wilt. If this is the case, nothing can be done for them. This article will explain more: https://www.gardeningknowhow.com/edible/vegetables/tomato/wilting-tomato-plants.htm

Tomatoes are warm weather fruits, so when the weather starts to get cold, that will be the end of the tomatoes. You can pick unripe tomatoes and bring them in for ripening: https://www.gardeningknowhow.com/edible/vegetables/tomato/how-to-turn-green-tomatoes-red-how-to-store-tomatoes-in-the-fall.htm
You might like to try growing tomatoes indoors, for some fresh fruit all year. This article has some ideas: https://www.gardeningknowhow.com/edible/vegetables/tomato/growing-indoor-tomatoes.htm

This can be a common and very frustrating issue.

Usually brought on by temperature or stress.
Other issues can be lack of pollination, lack of water, insect or disease, to much or to little nitrogen.

Go easy on fertilizer, water deeply, use good growing practices, plant flowering pollinators near the garden, search out plants that are heat tolerant.

https://www.gardeningknowhow.com/plant-problems/environmental/heat-stress-plants.htm

This is caused by a lack of calcium/magnesium. This can happen when a tomato needs more of it than it has available, and some need more than others.

This has a very simple cure. Dolomitic lime. This will provide calcium, and magnesium while keeping the pH stable.

Water it. Wilting means that it does not have enough water. This article will help you to grow tomatoes to their potential:

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