there are sources in shamanism where you can lose soul pieces. Sometimes traumatic events or clingy relationships can cause you to lose soul pieces. you can always bring them back. If you lose soul pieces, you might have moments where parts of your memory are blank or you feel empty inside or you might keep having white flashes in front of your vision.
In native culture many believe a camera steals a bit of your soul away and traps it in that moment in the photograph. Some people also believe a soul isn't something you're born with but you earn over time through prayer and sacrifice.
I don't feel you can loose your soul, or pieces of it. For argument sake if you lost your soul, I feel you would slip into a coma as your body would still work but what makes you you [from a religious view not a scientific view] has left your body, and until it has returned those things [like emotions and memories] are lost. I don't feel as though you could loose your soul, maybe shards or pieces, but with person strength and your spirituality it can be repaired.
Speak with a spiritual leader, or someone spiritual you can talk to. If there is no one, meditate on the question, or ask your personal deity. The divine is within us, so you can speak with them.
True. Shamans view illnesses such as depression as a way of losing a piece of your soul. So they act as a vessel to ask the holy spirits to bring back the lost piece through the Shaman's body. That's the way for a shaman to heal a patient.
I don't know about losing the whole of your spirit however. It can't mean death as a clone of a human being doesn't have more than just a body (as another human being has created it through genetic ways or maybe they have breathed energy into them from their own somehow?)
I would say the soul of a person is the real identity of them but what about clones? It's not really explainable unless one uses the theory of "earning soul over time" as Nekoshema mentioned. It's arguable.
It kind of depends on how you "lose" your soul.
If its a emotional issue, your emotional mind will kind of shut down and you might not be able to feel any emotion at all.
If its caused by supernatural forces, like possession, You can lose control of your emotions and even your body if the spirit is strong enough.
I don't believe that you could die from it though.