My sister and my sister-in-law were the same way (with food and vomiting anyway). I would bring it up to your doctor at your next appointment. You may be dehydrated from not getting enough nutrients and fluids over the past few days, hence the headache today. I mean I'm no doctor so don't take my word for it but that might be it.
Your doctor may have something you could take. You're like a step away from the 2nd trimester when things are supposed to level out and get better so hopefully there is an end in sight!
if it stays like this or gets worse i would call your ob and talk to them about what you should do, if the throwing up is getting bad then they can give you an anti-nausea medication. lots and lots of water. you can also ask your doc what you can do about the headaches. sorry i dont have a better answer for you but Joy is right, the only thing we can take is tylenol.
funny thing is i havn't thrown up all day and i get this headache ... a few hours after posting this i decide to take a small bite of something to eat and before i know it, im throwing up. I havn't felt this way since I was about 8wks, but it was worse then. :'( I try and eat/drink what I can, but it almost seems impossible.
Just Tylenol. No Ibuprofen. No Advil, no Aleve.
Throwing up personally gives me headaches. Also dehydration gives you headaches. It sounds like throwing up might be causing you to be dehydrated so you feel weak and just blah. If you begin to have symptoms of severe dehydration you'll need to get IV fluids. So between meals make sure you're getting tons of fluids if you can keep them down!