Dying Plant Needs You!?

I have a Christmas cactus- also called a zygocactus I think- that refuses to be happy. I have no idea how to care for it. The poor guy looks so close to death. The thing's leaf pieces are wrinkly. Water helps, but only for a day or two. It was shedding limbs for about 2 months, but has now stopped. I have had it since December and I just want it to be healthy. Help please!

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