I would suggest you stop going into high places and falling off of them
. Damage is altered with the height of the fall (falling two levels will do more damage then falling one) the the combined weight of your armor, weapons, items in your pocket and bag. The heavier you are the more likely the fall is to kill you. especially if you have low mage-ish constitution you shouldn't climbing into high places carelessly.
Sorry you lost items with your fall, all you can do to avoid this is watch your step in the mountains and do less roof hopping ^^