1 Pain that does not diminish with rest, and pain that may be worse at night than during the day. 2  Back pain along with constitutional symptoms, such as loss of appetite, unplanned weight loss, nausea, vomiting, or fever, chills or shakes.
Onions produce the chemical irritant known as syn-propanethial-S-oxide. It stimulates the eyes' lachrymal glands so they release tears. Scientists used to blame the enzyme allinase for the instability of substances in a cut onion.
A. Meat tenderizer contains papain, an enzyme from the papaya that helps break down protein. Doctors have recommended applying it to stings for years so that the papain can break down the venom. Your reaction sounds exceptionally severe. It is unlikely that a cut onion will work so long after the sting.