What Causes Weakness And Uneasiness In Stomach?

Hi! For about a week in a half my tummy has felt weak and uneasy. Im overly tired n I get really hot from time to time kinda like hot flashes. I already took a pregnancy test it was negative. I don't know if its the flu or my gastraridus (acid reflux) gave me an ulcer. Its just a weird sick uneasy feeling like queasy ans warn down feeling