I am 21 weigh just under 9st and dont have much if any medical history. But about 4 times a year I get excrutiating abdominal pains in waves generally as I wake up from sleep, and if I stand up I feel instantly sick too, but if I lie down I only have the stomach pain and no sickness.  Goes after I fall asleep, wake up about an or so later feeling fine.
Hi. The excruciating abdominal pains in waves generally as you wake up from sleep, are usually due to Irritable Bowel syn Chat Doctor.  The probable reason being, when you get up from the sleep, out of calmness to face the day-to-day realities the intestines respond by spasms. This is when you are stressed out. And to confirm we have to rule out many diseases like Gastroenteritis, Tuberculosis, Crowns etc. by the following tests. Blood for CBC, liver and kidney function tests, sugar to rule out diabetes, urine and stool tests. Also, to get ultrasonography and / or CT Scan of the abdomen, diagnostic laparoscopy, endoscopies if required. The treatment will be according to the diagnosis.