<s>[INST] A few months ago, i awoke vomiting a very black substance and also asperated on it. For 2 days prior to this my husband said i was out of it. I would not get in the car to go to er and my response was to fly back to bed. What could have caused this problem? [/INST] hello,welcome to HCM,Thanks a lot for the queryblack substance may be the undigested food that gets mixed with acidic gastric juice.do take an antacid.it should help.else get an endoscopy of the stomach done as it could be a case of bleeding in the stomach.hope you get well soon </s>