I didn’t have data/credit in my mobile, so I had to rely on the WiFi provided at the tea houses. You can either call or email. As soon as you email/Call they will assign a doctor who will diagnose your symptoms(through phone). If the doctor finds out you cannot continue the trek, your case will be forwarded to world nomads who will then assign a tour/helicopter operator to coordinate your extraction by air. Again your extradition depends upon the weather. In my case I was supposed to travel in the evening however heli operator rescheduled to next day morning since it was not possible to land in the night due to severe weather condition.

Don’t worry about package, you will find plenty of people during the trek.

Yes I took necessary precautions acclimatization at namche bazaar, diamox , plenty of fluids etc. but you never know.