hi, for the past five or six days ive been feeling a numbness in my left arm along with light pain in one area of my chest and the occasional feeling of being stood in an elevator, im only 20 and i flew to australia a week ago and was wondering if this may be the reason.
Numbness in the arm with a pain in the chest (left chest?) could be a sign of a "pinched" nerve in your neck. Maybe while flying you slept with your neck a bit funny, which may have irritated a nerve?  Either way, if your symptoms are not improving over a few weeks, further testing can be helpful (MRI of the cervical spine).