Hi,thanks for writing to HCM. By the description, your symptoms will not typically point to a definitive diagnosis.
Pain arising due to reflux esophagitis
, typically will be retrosternal and will not radiate into arm. Whereas pain due to cardiac cause will be present "diffusely" over the anterior chest wall and will radiate down into arm. Cardiac pain also gets worsened due to exertion of any form.
And pain arising due to muscle spasm will be well localised and hurts badly during particular movements involving those muscles.
So its always better to get evaluated for anysort of chest pain
. Hope this helps