Is it possible that the shaman in that village slipped you something when you weren't aware of it which caused the hemmorages on your back. Shamans can be very powerful persons in their villages and may have seen your inquirey into the story of the Allghoi khorkhoi as a possible attempt at taking some of his power over some of the local, superstitious villagers. You mentioned the saxaul roots and how it can be poisonous. Perhaps the shaman slipped some of this into something you ate or drank. In small enough amounts (Perhaps even a diluted quantity)the physical symptoms could have manifsted themselves into your dream. It is too bad your doctor did not think to take samples of your blood and have them analyzed for possible poisons.