I started my first day of pre op liquids yesterday, and by night time I had a mild headache. Worked up at 3am and felt like my head was going to explode. It was so painful. Took some ibuprofen and codeine and eventually went back to sleep. Woke up for work and I can still feel it lingering. I don't know if I'm sick, having caffiene withdrawals or if my body is upset. I'm on VLCD optifast. Has anyone else had headaches when switching to liquids?

I've been on the liquid diet for 3 weeks now...I have only had a headache once and that was when I hadn't drank anything in a few hours...as soon as I filled myself back up with fluids I felt better. Maybe if you were a caffeine addict before you are having withdraws. I was a soda addict prior to surgery but have not experienced headaches...everyone is different though. Hope things get better for you!

Could be low sodium levels. Have you tried broth? Regular, not low sodium.

I have taken Panadol with caffeine in it and it's gotten a bit better. I can still feel it lingering. I'd love to have broth but no idea how to get it? I live in Australia. How do you make/buy broth? Haha!

Go to Woolies and get some Chicken stock