We can lose parts of our spirit, or life force energy, due to any kind of trauma - it is a form of dissociation. Often we hear people say "I was just beside myself" or "I'm just not all here", or "I feel numb, lost." And those statements are, on the energetic level, absolutely true. We can be "outside" of ourselves, and parts of ourselves can become lost. We then have to call our energy back to us.
To do this, find a quiet time and private place where you won't be disturbed - get into a prayer or meditation state, and, as with any sacred healing ceremony, when you call your spirit back, you may want to state an intention that only that energy which is the essence of Unconditional Love, and that energy which is for the Highest Good for your Life return to you. It would be good also to set up a white light around yourself before you begin which puts this in place also. You can ask for guidance and protection from Great Spirit, the Creator, God, etc. That way you are very clear about what your intention is and what you will only allow into your space. Lighting white candles is a good idea too, as they represent higher love, compassion, and purity.
Now, send your awareness gently out into the universe, asking that it find, connect with, and bring back to you your spirit that has left due to trauma. Just sit quietly in an open and receptive state, profoundly calling your spirit to you and absolutely choosing to have all of yourself back with you. Allow it to come to you, whatever is ready and willing to return. Not all of it will return all at once. That can be an overload. Just open to what energy does return.
When you feel complete with this experience, slowly open your eyes. If you choose to, you can write in a journal about what you learned and what guidance you were given. Take some time to integrate this experience. Don't go out into the world too fast or try to do too much afterward, relating or otherwise. Drink water, allow yourself to integrate and process what you need to, and remember to blow out the candles!