Thanks for using this forum.
As per the description of your symptoms, firstly you should get an ECG done to rule out any underlying heart condition. The pain on the left side and radiating towards the arm can point towards the above.
If you have any associated symptoms such as burning sensation in mid chest then a upper endoscopy
would be helpful to determine underlying gastric problem such as gastritis
or gastric ulcer. You should consult with your doctor for full assessment.
Feel free to ask further queries.