What Causes Sudden Pain In Stomach,migraine And Exhaustion?

I'm a 16 almost 17 year old girl and I am concerned about my health. Starting Sunday, I did not feel well at all, I had a really bad stomach ache, migraine, exhaustion, and I was freezing and it was 89 degrees out or something so i took my temperature. It said it was 104.9. It's Tuesday now and i am still having the same temperature and the same symptoms but my mom keeps telling me its nothing. What is wrong with me?