Hi. Thanks for your query and an elucidate history explaining your presence in Arctic and costly affair to fly.Also noted history of your fall on a stair and pain at the right low back and behind the armpit. Your history of pain in abdomen worries me too. The possible diagnosis is a retro-peritoneal hematoma . In this condition the are on the back-wall of the stomach has bleeding from the loose tissues it supports the organs like kidneys and major blood vessels, pancreas and part of the colon. The bleeding in this area stops due to tamponade , a natural body mechanism against sudden re-bleed and death. You can do the following tests and take help of your friends with you in the arctic. I am sure your have a machine to check temperature and blood pressure in your Emergency kit. Get the blood pressure and pulse. If they are within limits nothing to worry. Watch for the color of the stool and urine, if normal nothing to worry. Put a mild pressure n the abdomen, see whether there is pain and also see if the pain is elicited on releasing the pressure, this is called rebound tenderness. If all the signs and symptoms are normal , keep yourself under observation. Report to the flight back if : The Blood Pressure falls. If the pulse rate starts rising If the urine or stool or red. If there is distention of abdomen, nausea, vomiting You have to fly back, life is most precious than the job. If you are alive, you get many more jobs.