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It sounds like transplant shock. This article will help:
https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm

If you grew them from seed, they may be suffering from sunscald. In the future, this can be prevented by acclimated the seedlings before planting them out:
https://www.gardeningknowhow.com/garden-how-to/seeds/how-to-harden-off-your-seedlings.htm

No, not always, but this depends on how much shock the plant is in. Usually you can give the plant some extra TLC and it will come out of it fine. This article will help with fixing shock in plants: https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm

This article will help with that:
https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm

It sounds like it is either mealy bugs or spider mites. These articles will help:
https://www.gardeningknowhow.com/plant-problems/pests/mealybugs-white-residue-on-plants-leaves.htm
https://www.gardeningknowhow.com/plant-problems/pests/insects/spider-mite-treatment.htm

It is either a watering or nutrient issue. Make sure that they are getting the right amount of water (soil should stay moist but not soggy) and give them some slow release fertilizer. That should fix it.

Gray mold, or botrytis, is a fungal disease. Once this fungal disease starts, it will spread to the rest of the healthy plant. Botrytis thrives in humid, damp conditions with cool nights. Spores are spread by wind and splashing rain or water from one plant to another. You will need to keep some ventilation going and remove all dead and dying parts of the plant to deter the mold from growing. You can spray the plants with an approved fungicide (check the label) to keep the disease from spreading, but it will not stop already infected plants.