<s>[INST] after eating a meal  in a in a restaurant I suddenly  started to get severe back pain and felt faint and weak the pain got worse I could not stand up alone my legs went like jelly, then I vomited, the I felt much better but I am still getting some back pain and my stomach  is queasy this all started  last evening. could it be something I have eater ?. I must say I have never felt so ill so quickly, [/INST] Hi,It seems that you might be having some gastro-intestinal infection due to contamination of food taken.Take some anti spasmodic medicine like Dicyclomine.Take plenty of water to clear to wash out infection.Take light diet for 2 days.Ok and take care. </s>