I Feel Nausated When I Wake Up Until I Eat

I feel nausated when I wake up until I eat something. I have a high chest pain which subsides (heartburn, I guess) and what feels like cramping and coldness of my neck and shoulders ( also passes in minutes). Could this be thyroid? I did a stress test which showed my heart function normal- slight scarring from an artery blockage (stent placed) a year ago January. what is this?