Anyone on the Jenny Craig diet?? Question!

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So I've been on and off the JC diet for around 3 years now. And I've just recently gone back onto it at 1200 calories a day and I've noticed that this time around I'm overly tired and mopey. I'm not sure what to do about it because I've been going to the gym steadily for the past 6 months but now I feel way too tired to even think about going.

Has anyone else had this problem??!