Hi. I have a weird choking feeling of something caught deep in my esophagus. I woke up this morning and drank a full glass of water and instantly threw up all the water followed by white stuff and it felt like there is more but it turned to straight fresh blood. I still feel like I need to throw up because something's making me nauseous and I feel it in my throat and I can still taste blood but I haven't vomited again after that one time. When I spit up, it's only clear or a little mucus, no red. What's going on? Should I see my doctor?