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This article should help:
https://www.gardeningknowhow.com/houseplants/cyclamen/cyclamen-care.htm

It should be in a potting medium that drains well but is moisture retentive.

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soilless-growing-mediums.htm

Yes, you can trim it back. Leggy plants are normally a sign of insufficient light. You may need to move the plant or provide more light to its location. Here is more information on caring for these plants: https://www.gardeningknowhow.com/houseplants/cyclamen/cyclamen-care.htm

Unfortunately, your photo did not come through. I am unable to see the extent of the damage.

It sounds like transplant shock, though. This can happen when the roots get jostled around and some of them get broken. If the damage is severe enough, it can kill the plant fairly quickly.

If the roots were not disturbed at all during the transplant process, then overwatering could be the issue. Usually, this will take several days to show wilting from overwatering, but if the roots are completely saturated then they cannot breathe. It is possible that the plant could show symptoms sooner.

Unfortunately, the only remedy for either is proper care. The plant will recover once it is in the ideal conditions that it needs to thrive.

What I can do, in the meantime, is point you towards an article that will lay out their care needs. This will help you to give your Cyclamen the best chance possible for survival:

https://www.gardeningknowhow.com/houseplants/cyclamen/cyclamen-care.htm

This article should help:

https://www.gardeningknowhow.com/houseplants/cyclamen/propagating-cyclamen-plants.htm

If you grew it for six years, that is amazing. It may have finally worn out.
I don't think it's dormant. Watering of this plant should only be done when the soil has dried out, and care should be taken to water around the edges, not directly into the crown of the plant.
Too much water can lead to root rot. Cyclamen also need a cool growing environment. Here's an article on how to care for cyclamen:
https://www.gardeningknowhow.com/houseplants/cyclamen/cyclamen-care.htm

Unless the house is over 90 degrees F, I don't think the indoor temp is an issue. Improper watering is the No. 1 issue with indoor plants. If the watering is correct, the drainage may not be. Are there adequate holes in the bottom of the container? If not, you can put a pot inside a pot, and the inner pot can have drainage holes. When watering, remove the inner pot to let water drain before returning to the outer pot.
Plants also need fertilizer. Be sure they are on a regular fertilizer program. You can use slow release granules such as 10-10-10 or the fertilizer sticks for convenience. Or use liquid fertilizer that you add to the water.
Another common problem is light. If the plants don't get enough light, they will suffer.
Here is more:
https://www.gardeningknowhow.com/houseplants/hpgen/reasons-houseplants-keep-dying.htm
https://www.gardeningknowhow.com/houseplants/hpgen/desperate-houseplants-dealing-with-common-houseplant-diseases.htm