This is just my personal view and my view only.
I remember getting really sick one day. Couldn't get out of bed, almost was a goner. My parent decided to call in the shaman and heal me spiritual. I was sitting on the shaman table as he goes around me, spliting water at my face. He say there was a evil spirit in my body and that he scared the demon away. he say I was heal, even though I feel sick still.
That night, my fever went up even higher. I finally drove myself to the ER, where they put me on IV and give me antibodies. I stay at the hospital for 24 hours while they monitor me. Slowly, i got better thanks to the medicine.