Day 1 of opti ... ooooooh my
I'm on day 11 of 14 and I found that it definitely got better. The first 2 days were the toughest. The 3rd day was a transition day and by the 4th day I was fine. I went to the gym, walking etc. I didn't notice any loss of energy. I actually think I had more.
I love all my Optifast concoctions. Especially the chocolate and banana flavor ones and the vanilla with tangerine/grapefruit Crystal Light.
Hang in there. It'll get better. Keep your eye on the goal.