Peptic/gastric ulcer? Dull burning pain in sternum, slightly left center. Woke with "acid throat"? Tums (calcium carbonate) helps a bit. If "p/c" when is it an emrgcny?

Probably esophagus. Description is more for reflux of stomach content/acid into esophagus. Avoid coffee, tobacco, alcohol, fatty foos, spicy food, lying down after eating, eating before bedtime, chocolate. Short term ppi meds may help. Any shprtness of breath, sweats, etc see md asap. Doubt cardiac; unlikely ulcer. Call md if continues.
Call doctor. Would call your doctor and tell him your symptoms. He can determine the next best course of action.