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This is caused by either a cold draft on the plant or a lack of humidity. Check for a cold draft, possibly from a door or window. Also, try to get the humidity up around it. Either a humidifier in the room or place it on a pebble tray to increase humidity.

If the plant is out in the sun and there are no other issues with it, then it's highly plausable that it could be the result of winter burn. The damaged leaves can be trimmed away and the plant should recover fine. If there has been a lot of moisture lately, it could also be attributed to a fungus. Treating with fungicide should alleviate this.

It can recover if it is still alive. This article will help you with protecting it from the cold: https://www.gardeningknowhow.com/plant-problems/environmental/protect-plants-in-freeze.htm, https://www.gardeningknowhow.com/plant-problems/environmental/frost-how-to-protect-your-plants.htm

This is sooty mold. This article will help you: https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm

They need a few hours of late morning to early afternoon light to bloom well. The leaves may be an off color if they are competing for water and nutrients with surrounding trees, so it may be best to move them. Spring is the best time to move them, but take steps to prevent transplant shock. This article will help with that: https://www.gardeningknowhow.com/plant-problems/environmental/learn-how-to-avoid-and-repair-transplant-shock-in-plants.htm Holly Tone is fine for these plants, as they like their soil a bit acidic.

It sounds like you may have thrips. This article will help:
https://www.gardeningknowhow.com/plant-problems/pests/insects/controlling-thrips.htm