headache on pre op

Is this normal to get a headache on pre op diet? I'm just wondering if anyone else had this problem.

Yes it is normal it happened to me also.

I was told to eat an extra 1/2 fruit , and to check my blood sugar(im diabetic)

I had it, too. Also I felt very weak. The second week has become easier but still some days I have the headache. I asked my dietician if I could throw some spinach in my morning shakes. On the days I do I feel 1000% better all day.

Totally normal. The first 3-4 days are the worst and then you'll start feeling better. Make sure you're drinking enough and hang in there. 

thanks for the reply everyone I knew it wasn't gonna be easy but I know it'll be worth it.

I had a headache so bad that I considered going to the doctor.  It lasted for about 3 days.  I was going through caffeine withdraws.  I have added a small bit of caffeine back to my diet, but only 1 cup of coffee/tea per day when I want a little pick me up.  I promise you will get through this.  Keep your head up!