Only on day two and my head is killing and not allowed to take anything that will thin the blood

Any suggestions ?

Not even Tylenol? Is your headache form caffeine withdrawals?

Probably could but I just don't have any at work with me

All I have is excedrine.

It could be from caffeine

If you're on your preop diet the headaches are a sign you've thrown your body into ketosis. That's exactly what you want. It's a totally normal side effect.

They will go away in a day or two. Tylenol should be ok, check with your doc. Caffeine withdraw wont help the situation much either.

You'll get through it. It's tough but you can do it! Good luck!

Headache is also one of the very first symptoms of dehydration. Try drinking as much water as you can hold. If the problem is dehydration, the heacache should disappear within 15 to 30 minutes. I enjoy fishing and have seen this work like a charm many times. Easy to test.