No worries as you have booked trekking with agency like mine. The guide with you is not just a person who shows you track and tell you about the local culture and tradition. He is somebody who will help you with medical assistance as he is good at first aid service and this what they learn as a trekking guide. If you are really in bad condition then also you do not need to worry because he will be in constant touch with us (agency). If you require evacuation then also you will be evacuated on time by helicopter.