This happened to my husband a couple of weeks ago but his was induced by heat exhaustion. We were setting up a fire works stand in extremely hot weather. We were both sweating faster than we could replace the liquid. He had gotten dizzy while up high, became unstable when walking, and then threw up that color (having not eaten anything that color or taken any medication that color).
He then started having weird temple and ear pain every time he would drink something cold for a while. Later we found out he had a sinus infection.
I told him at the time that I thought it was drained infected nasal mucus and he said he was not having sinus infection symptoms at the time but it later turned out to be that.
I hope this might help shed some light on your situation. Watch for headaches in strange places, sensitivity to cold and if any sinus infection symptoms actually show up.
Good luck!
Lindaru
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