Having abdominal cramps, diarrhea, breaks out in cold sweat during night. has fresh tuna night before cramps started. what could be the cause?

Likely viral: Symptoms of viral gastroenteritis.Viral gastroenteritis is an intestinal infection marked by watery diarrhea, abdominal cramps, nausea or vomiting, and occasionally fever. The most common way to develop viral gastroenteritis — called stomach flu —is by contact with an infected person or by ingesting contaminated food or water.

Possibly: Symptoms match ‘food poisoning’ as well as other possible infectious illnesses. Illness from fish often begins 3-6 hours after eating but may take longer. Symptoms include those you mentioned, nausea, and vomiting. Either way, recommendations are the same: contact your doctor if fever’s high (over 38.5◦C or 101.3◦F), blood in diarrhea, diarrhea for >3 days, or if vomiting frequently.