What Causes Frequent Stools, Hot And Cold Spells And Fatigue Post Cervical CT Melogram?

I ve had a dull headache for a few weeks. Everyday. Could be from a pinched nerve in my neck. But for about a week whenever I eat I feel sick. Bowel movements becoming more frequent. On & off hot & cold spells. Overall feeling lethargic. Had a cervical CT milogram on Friday. Feel a lot worse since then