Once in july had tingling and numbness, +severe pain/heaviness under sternum/pain in back.was very anxious at time, anxiety attack?+ i have acid reflux

Sounds like: Some of this symptoms are compatible with a panic attack. Ask your dr. Best of luck.

Panic attacks sxs:: Anxiety; rapid, pounding heart; chest tightness/pain; shortness of breath w hyperventilation; hot /cold flashes; butterflies in stomach, nausea or vomiting; tingling of mouth or extremities; ^ sweating; feeling faint or lightheaded; headache or shaking, difficulty swallowing or tight throat; they usually peak w/i 10 mins. Anxiety symptoms can include feeling nervous or irritable, muscle tension