Q.Bamboo
My Doble Bamboo is not looking healthy. I have watered it, fertilized it, loved it. It looks sad. Help

Is your Bamboo planted in soil or growing in water?
Here are some links with care information and should help you pinpoint the issues.
Root Rot is the likely cause, as the level of water is important.
https://www.gardeningknowhow.com/houseplants/lucky-bamboo/growing-lucky-bamboo-indoor.htm
https://www.gardeningknowhow.com/houseplants/lucky-bamboo/lucky-bamboo-rotting.htm
https://www.gardeningknowhow.com/ornamental/foliage/bamboo/bamboo-plant-diseases.htm