What Causes Sudden, Severe Stomach Cramps, Nausea, Vomiting, And Cold Sweats, Followed By Relief After Passing Regular Stools?

Hi, I am a 42yo female. I woke up in the middle of the night with bad stomach cramps. When I went to the toilet, I couldn’t pass motion immediately but it felt like I needed to badly. I kept regurgitating and wanted to vomit and pass motion simultaneously. The pain was excruciating and I experienced the below: - 1) shivering and trembling 2) cold sweat, eyes kept shutting tightly uncontrollably 3) breathlessness 4) leaning forward made the stomach pain worse I was completely drenched in cold sweat and due to the intense pain I unknowingly broke out in tears. I vomited a little of just fluids, and eventually cleared my bowels after ~ 15mins (regular stools, followed by some soft stools and ended off with just fluids gushing out like a tap). I felt almost completely OK immediately after that, with just a slight churning of the stomach. I had the below food earlier in the day: - Breakfast: my daily peanut butter spread on bread (2 slices) Lunch: homecooked pork, bitter gourd with rice ~ 5pm: A cup of Nestum cereal (3 heaped spoons) Late Dinner: Dined out, pork with rice I have never experienced anything like this in my entire life. What could be the cause? Thank you in advance.