For About 3-4 Days Now I Have Been Experiencing Food

For about 3-4 days now I have been experiencing food poisoning-like symptoms, horrible cramps and stomach pains, vomiting during the whole first night, having trouble eating, fatigue, nausea etc etc, since I am on the fourth day of experiencing this, I am pretty concerned, I'm kinda weak but still having the horrible cramps and trouble eating. Is this food poisoning? I believe it may be from pea and ham soup I ate at a friends almost 5days ago, what can I do to help?