Why was i throwing up after eating a cold cut sandwich from a convenience store? i did that about a month ago too, same sandwich,was it out of date and the sandwich spoiled? thinking of not buying it anymore so what causes that? nothing else does tha?

The possibilities include that the sandwich was spoiled-perhaps not stored cold enough and bacteria grew on it. It could also be it was overly fatty and you are having difficulties with fatty foods (although other foods would likely bother you as well). In either case, not buying that sandwich anymore is a reasonable solution. And, monitor for a similar reaction to other foods in your diet.