[…] around the affected area severe bleeding vomiting lightheaded-ness or loss of consciousness For more information on what to do if you're stung, go to the NHS website, here
[devonlive.com]
Stings are extremely painful and cause a throbbing pain and swelling in the affected area, sometimes accompanied by a numbness, nausea, joint aches, headaches, abdominal cramps
[sites.google.com]
[…] on your face or genitals been stung by a stingray You should go to A&E or call 999 if you've been stung and have difficulty breathing chest pain fits or seizures severe swelling
[devonlive.com]