What Causes Sudden Abdominal Pain And Sweating While Having Juice?

Hi, I don t know how much you need in order to give me an accurate answer to my issue but here goes: I woke up this morning, feeling fine. I went to the kitchen where dad had prepared lemon and grapefruit juice, ao I drank it carefully. I have not had breakfast yet. In the middle of sipping the sour juice I suddenly started feeling an abdominal pain in the sense that it made me feel a bit sick and I started to feel that I was sweating. I went to lie down on my bed and I am now a bit better, feeling less stressed and less sweaty. The abdominal pain is gone and so is the ill feeling along with the sweatiness. I am not allergic to antything and I am not obese or lack weight and nor do I have high blood sugar. Do you have any idea about what happened to me this morning?