3 days after mosquito bite, painful blisters, swelling, rash, nausea, headache, abdominal pain, non-responsive to benedryl/hydrocortisone. what to do?

Be examined: This may have been another type of insect that causes more systemic symptoms. There may also be an infection as a result of the bite. See your doctor soon.

See doctor: Local inflammation from mosquito bite which comes on 2-3 days after the bite may be due to Skeeter Syndrome. However abdominal pain is unusual. Mosquito also carries virus such as West Nile fever and thus you need to get to your doctor ASAP to get this checked out.