Whenever i eat, i get bloated and extremely nauseous, and i can feel the bile rising in my throat and warmth in my stomach. what could be the cause?

Many, Hiatal Hernia,: esophageal stenosis or esophageal peristaltic dis-coordination issues would be high on the list given symptoms. Unlikely bile (if not green) in throat > stomach fluid/acid; irritating to esophagus & especially to lungs if aspirated. Motrin ↑es rates if GI mucosal ulcers, best avoid for now. Seek out ENT or GI specialist worthy of your trust for assistance & remember primary physician always self.