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Tamar Braxton says she very nearly died this weekend ... explaining her friend found her in a pool of her own blood -- and, she says she doesn't know what happened.

The singer-songwriter posted about the harrowing experience on her Instagram Stories Tuesday ... admitting she struggled to write the news -- but she feels she needs to tell the whole wide world about what happened because people keep calling her and asking. Instagram / @tamarbraxton

On Sunday, Tamar says, she almost died ... saying she was found lying in "a pool of blood from my friend with a face injury." She says the injury has worsened over the last few days.

Braxton says she fractured her nose, lost a few teeth and is having a hard time moving around. Her perspective on life is different, too now, she adds.

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