"He feels like it's a trying time for his spirit, but that can be a good thing. He isn't one to run away from these things. He leans in and listens, and comes away a stronger, better man," a source tells PEOPLE of the rapper

Kanye West was hospitalized for exhaustion on Monday, and a source tells PEOPLE he “feels like he’s under spiritual attack.”

Hours after West, 39, canceled the remaining 21 dates of his Saint Pablo tour, the rapper went to the hospital following the advice of his doctor, a source says.

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“He is exhausted and currently dealing with sleep deprivation. He went to the hospital at will under the advise of his physician. He’s fine,” a source previously confirmed to PEOPLE.

In the wake of his wife Kim Kardashian West being held at gunpoint and robbed of millions of dollars worth of jewelry on Oct. 3, the musician and clothing designer is “in a very reflective place right now.”

“He feels like he’s under spiritual attack, and has been for awhile. It’s not just the big things; it’s smaller, quieter things, internal things. You might think that it’s about Kim’s robbery, and while that didn’t help, that’s not what’s going on here. He’s dealing with a lot more subtle issues,” the source tells PEOPLE.

“His mother died in November, so this time of year always brings him a lot of pain. He keeps that pain internalized, but sometimes will talk about how hard this time of year is for him. He works through the pain every November,” the source adds. West’s mother, Donda, who died in November 2007 at the age of 58.

But although the father of two is physically exhausted from lack of sleep, he is also emotionally and spiritually tired — and is processing things internally.

“He feels like it’s a trying time for his spirit, but that can be a good thing. He isn’t one to run away from these things. He leans in and listens, and comes away a stronger, better man. But it hurts him; his spirit is vexed. But that’s where growth comes from,” the source says.

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“Sometimes, darkness creeps in, and Kanye wrestles against it. He talks about that a lot. It’s exhausting, and it takes everything he’s got. He’s just so tired now; he’s very low energy and feels like there’s a grieving in his spirit. It’s very hard to explain, but something has happened recently, where he’s not the ‘Ye that everyone knows.”