I get headaches too when I go back to healthy eating or start low carbing. But consider this about your moodiness.
There's this guy I've known since high school(his brother was my best friend)-He'd always been heavy, but he was tall, so he kind of carried it all over, yah know? Well, one day I stopped by to say hello at his folks house, and OH MY GOSH! He was a different person; he'd lost 80 lbs in 6 months. His face wasn't the same at all! He talked to me about his path down-
he found out he was type II diabetic when we were in our 30's.
He was sent to classes by his doctor for diabetics, and he saw many other long term type II's and got scared silly.
He began a healthy diet and he told me sometimes he'd actually cry. He said it had been a part of his life so long to eat all the time, that he was lost without it.
He told me that he couldn't recognize himself in the mirror, he was adjusting. My amazement at his looks was something he got everytime from people he hadn't seen in a while. He said it was an awesome feeling.
He felt proud of the fact that he can now run an 8 minute mile. He said his wife had lost 40 pounds too. She had subscribed him to a muscle magazine and he was considering developing a six pack! Can you imagine?
His diabetes is in complete control. His HbA1c was in the 4's. But he also said that every day he thinks about his sweet fix; how he's gonna get it.
I know I have a hard time giving up the hand to mouth where I'm used to it- the movies, the computer, reading...