Thanks for writing to us.
It seems that the cause of your internal fever
is likely to be a hormonal
disturbance like thyroid hormone imbalance
. The sudden pain in the abdomen might be related to the food you have taken. You can take an antispasmodic available over the counter and see if it helps. In caser the pain is persistent then consulting your physician will be helpful.
I hope this information has been both informative and helpful for you.
Dr. Rakhi Tayal