"when I get stung the spot gets red, itches, swells a bit, etc?"  "should I
worry about this?"
 
I am a lowly beekeeper, not a doctor...but I did have to go through a
desensitization program 25 years ago.  My symptoms, which required the
program, was difficulty breathing.
 
IMHO, your reactions are normal and you need not be concerned.  However, be
careful and watch your symptoms.  I understand the poison effects the
nervous system so that muscles do not receive the signals they should to
operate properly.  If you have any difficulty breathing or feel light-headed
after a sting or stings, run, do not walk, to an emergency room.
 
With only 3-4 stings a year, you may not develop an immune response to
stings, so the symptoms might continue.
 
Lloyd
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Owner, Ross Rounds(tm), the finest in comb honey production.