I'm a 15 year old girl and have been having similar problems for around 3 1/2 years. I told the doctor about it and she said to go on a non lactose diet. I have diary all the time, but it never bothers me. I throw up or get extemely nauseous once a month. It happens once a month and it starts out with a dull pain in my stomach. When I close my eyes and stay still in bed the pain keeps increasing until I get up and sit in the bathroom for about an hour and start getting extremely bad chills where I can't stop shaking. Then after around an hour I walk bck to my bed and either it stops completely or gets even worse. When it gets worse I have to groan so much my stomch hurts. I start getting the chills gain and sometimes drift off to sleep. When I'm sleeping I can feel the pain in my body in my dream. It gets so bad that i wake up from the pain. Then I run back to the bathroom where the cycle repeats for 4-6 hours until I finally vomit.
please visit a pastor to pray for you or look up the deliverance prayers in the computer this maybe
a demonic attack dont worry Jesus is the great healer or you can check emmanuel tv. God bless you.