It might be heartburn Treysgirl, but you did the right thing in calling the surgery as chest pain is a side effect as so:
http://www.drugs.com/cons/Metadate_CD.html
...Side Effects of This MedicineAlong with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor as soon as possible if any of the following side effects occur:
More common
Fast heartbeat; increased blood pressure
Less common
Chest pain; fever; joint pain; skin rash or hives; uncontrolled movements of the body
Rare
Black, tarry stools; blood in urine or stools; blurred vision or other changes in vision; convulsions (seizures); muscle cramps; pinpoint red spots on skin; uncontrolled vocal outbursts and/or tics (uncontrolled and repeated body movements); unusual bleeding or bruising..."