Had What I Thought Was Food Poisoning From A Fresh

Had what I thought was food poisoning from a fresh veggie stir fry Monday. Puked and diahrea all Tuesday felt fine Wednesday. Lost five pounds over night. Felt good Thursday but got nauseous Thursday night started puking and actually lost consciousness for five minutes and took an ambulance ride to the er last night. Vital signs were great even when emt's first arrived. BP 117 over 79. Glucose 108 Ct scan showed nothing wrong with appendix and no fever. In fact it was 97.9 as it was at initial onset on Tuesday. Was pretty dehydrated at ER last night and they put two bags in me. White blood cell count was off the chart. Don't remember the number. Doctor is stumped. Wants me in this afternoon for a blood test to check blood count. 52 year old mail no smoking, drinking or anything and work out every day. Had a heart check up a couple months ago and it was great. Any ideas?