I am SO Weak

I am so tired and weak. I went to bed early last night but I was woken by a horrible headache at 11:30. From then on I had trouble staying asleep. Now it's 9:30 and I've forced myself to get up. I am so exhausted. I am eating to try and to get myself some energy.
I checked and saw that my Analysis Paper isn't due until  5:00 pm tonight, so I still have time. Which is awesome because I don't have time before class to write it.
Now my mouth is burning from those tacos and I feel like I'm going to vomit. Why can't I just be healthy?!
 
I did Arms yesterday and worked them out for 30 minutes with 6 min cardio & 24 min weight exercises. I used 5 lbs. It was fun, but hard. My arms don't hurt nearly as much as my legs did the day after.
I am pretty sure I'm going to barf.