What Causes Nausea,dizziness And Severe Vomiting With History Of Gall And Kidney Stones?

Hi two nights ago I came home from my sons football practice. I was hanging outside with neighors and went to check on my brother in the back yards. When i made it to the back yard i felt dizzy, nauseous, and weak. Then i started vomitting uncontollably worse than anything ive experienced. My stomach started hurting so bad that i passed out and was unresponsive. My neighbors called 911 and the EMTs told them i must have been on drugs or an alcoholic...i am neither. At the hospital they told my husband the same thing, which he reassured them I am not. I had a half of one beer before the incident. The docs rain blood test on me to confirm no drugs or alcohol as the suspect. It was Negative! Then the ran test on me for possible seizure, ekg, head ct, chest xray. Again all negative and i was still not really with it at this point. Finally after 3 hrs they gave me stomach acid medicine and nausea medicine as well as potasium because it was a few points low. Then they discharged me and said see a specialist. Its still the weekend so i havent scheduled an appmt but im worried they couldnt tell me what was wrong with me? I dont have my gall bladder and i have a history of kidney stones...any clues?