Sporadic Abdominal Pains I Ate Some Spoiled Meat, What Can I Expect?

I ate some spoiled meat, what can I expect? - sporadic abdominal pains

Linguiça ate about 24 hours and had abdominal pain and diarrhea, sometimes very painful for the last 8 hours or more.
I looked at the package and it seems that the expiration date was somewhere around 7 July, how terrible, but the person, it does not boil notices. = (

Will I get worse? And if it all end?
Am I obligated to give something and solve this over time?