Thanks for writing to us.
In all probabality you have deveolped "GERD" Gastro Eosophageal Reflux Disease as a result of Smoking
.The pain in the chest is also related to smoking and partly due to work out in your Gym (Myalgia
The best course of action is to stop SMOKING at the earliest/Now. In addition have H2 receptor antagonists such as Ranitidine/Antacids/ analgesics/Vitamin supplimentation/apply Rubifacients on the sholuder and chest areas.
If the above measures do not help you much, then try and consult an Internal Medicine Specialist for all Baseline Investigations including the X-Ray of the Part and follow the evidence based therapy.
Wishing you a Speedy Recovery.,
Dr Lt Cdr ASN Bhushan.,