Two nights ago I started feeling really hot so i took my temperature and it was 100.2, then i thought I was feeling better about an hour or 2 later, took my temperature and it was 100.7. The next morning when I woke up i had a little bit of a headache, but felt ok otherwise. I took my temperature and it was 98.6. I took it one more time about an hour later and it was 98.1. I felt ok so I went to work. Then a few hours after I got home from work, around 9, I took my temperature again because I started to feel hot again. But it was normal, 98.6. But about an hour later I took it again and it was 100.4. Then 45 minutes later I took it and it was 101.1. Then I went to sleep, woke up at about 2:30 a.m. drenched in sweat, took my temperature, it was 101.2. Then I woke up in the morning, had a headache like the previous morning, took my temperature, it was 98.6, a few minutes later it was 98.1, then about 5 minutes after that it was 98.2. Any ideas on why it keeps changing? And When it gets to 100 or higher I feel sick, so its not like I'm feeling ok and just wondering. I just keep getting worse at night and I'm fine in the morning other than the headache.