Welcome to the group!
Having a child that is physically dependent, I would recommend that you definitely take a good multivitamin each day as is recommended in the book. Also, listen to your body. If you are feeling low on energy because of physical demands, you may need to up your calories above the recommended 1000 per day. On days that I have more physical demands, like house cleaning days, etc., I usually eat more at lunch time to replenish my energy levels.
Good luck on the plan!