It all started a couple days ago, I woke up one morning and it felt like their was something in my stomach that I needed to throw up, though it never happened. At lunch that day whenever I swallowed food or drink it would hurt going down my esophagus, in the center of chest around my heart, then it got worse and worse. I can't even eat anymore because I double over in pain when I try to swallow something, along with that now whenever I inhale deeply it causes my esophagus to hurt. It hurts especially bad whenever I wake up, without me even doing anything it'll give me pressure like pain in my chest. Now, just today, I seem to have excess saliva building up in my mouth and I have to spit every couple of minutes, I feel like I'm going to barf and even pass out. Does anyone know what this could be?