What did you eat before this happened and how long ago?
Some things take longer to digest than others, some foods just sit there for a whole day.
If it looked like coffee grounds, it was probably old blood. Given how much you've been throwing up, might be some kind of esophageal tear (when I had my MW tear it looked like I straight up ate a coffee filter full of instant coffee and had it come right back up) or an ulcer.
ER might just tell you to see a PCP to get referred to a gastro for an endo.
__________________
"I don't know what I'm looking for."
"Why not?"
"Because...because...I think it might be because if I knew I wouldn't be able to look for them."
"What, are you crazy?"
"It's a possibility I haven't ruled out yet,"
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