Yeah, maybe will help if at all things will be little number in some corner and this number will indicate how many slots will it take in your inventory.

Well I tried to run from Mogilevka to Vyshnoye then red text popped up saying "you are extremly tired" so i drank 2 sodas and sit down using F3 and after like minute of resting I just fell unconscious and never woke up.

yeah its really annoying I was unconscious for like hour and then i gave up and respawn