the past two days I've had almost Constant heartburn/acid reflux feelings in my stomach, after eating some grilled food. it's kept me up and this morning i decided i had to do something, so i went into the bathroom and vomited. this vomit was extremely concentrated, brown, and stung my throat unlike even pure stomach acid had from vomiting. I also found a small, bloody piece of what looked like snot or something similar. What's going on?