Hello,
Thanks for the query to H.C.M. Forum.
Pain on the left side below breast, referred to left shoulder, left arm.
This may be due to,
Heart pain,
infections in left lung.
Most important symptom in this episode is
heart rate even after 20 minutes rest , that is 116 beat / minute means
Tachycardia.
Other point to note is breath and
nausea.
So we can not rule out the pain from
gastritis.
Gastritis develops pain on left side ,
gastritis develops nausea , cessation of breath.
So consult a physician and get in E C G , E C H O and other relevant test as suggested by physician.
Hope I have answered your query.
If further any question I will help.
Good luck.
Dr. HET