i have mild chest pain in my hand shoulder chest...

Wht is the treatment of mild chest pain ?
the treatment is according to the specific cause so you need to visit the ER right now to get a medical examination and diagnosis of the cause of your condition :
if you have any heart problems you need to follow up with a cardiologist urgently
you can take Esomeprazole 40mg for stomache problems
you can take Gemifloxacin 320mg once daily for 5 days for chest infection
you can take ibuprofen 600mg for musculoskeletal causes
there are many causes of chest pain that are
chest pain related to cardiac causes such as myocardial infarction or angina
in these cases it's associated with difficulty in breathing, sweeting, shoulder and neck pain
Chest pain related to respiratory causes, such as bronchitis or common cold or lung infection
in these cases, the pain is associated with cough, fever, chest-wheezing
chest pain related to musculoskeletal trauma, in these cause the pain is well localized and for long time and relieved by analgesia
chest pain related to gastroesophageal causes like reflux of stomache acid and hiatus hernia , and indigestion which is most likely your chest pain
what tests should you have ?
Physical exam
CBC
Chest X ray CXR
In some cases you need to do an endoscope

IF you mean GERD gastroeosphegeal reflux disease 
you must do barium swallow image to diagnosies the problem anf oif its high grade you may need surgery as niseen fundoplication