I initially wrote this a few months back to Maximum Intensity, an attorney who couldn't understand why his motivation was waning. I think it's applicable here:
This very well may be physical in nature (in which case you will need more time off), but it sounds more mental to me.
If it's a lack of drive you are experiencing, you must reevaluate why you started this lifestyle in the first place. If you can feel good about yourself through training and allow it to define you, you will never want its absence in your life. Let training validate your existence, let it differentiate you from the masses of those who eat Burger King daily and could care less about about their vitality, health, and looks. Being an attorney, you have a white collar job, like myself, and as such you spend the majority of the working day physically inactive...dealing with mental challenges and stresses. When your work day is over, look forward to the physical onslaught that hardcore training provides. You've used your head all day, now use your body.
Fear becoming soft and weak. Cherish the mental fortitude it takes for you to command your body to withstand the pain of balls-to-the-wall training. Take those mental characteristics that enable you to physically outperform others and wear it like a badge. You have withstood the pain of training and the discipline of proper dieting...those rewards are yours and yours only, you reap them. Very few things in life are so simple, with such a clear cause/effect equation. Where else in life is all your hard work reaped only by you? The inspiration and motivation is internal as well as external. You must stay mentally tough. If you quit training, you will lose all of this. How are you any different from the masses then? Where will your pride rest, what kind of badge will you wear then?
Envision what you want to look like. Bring it back, be superior, put gravel in your gut. You are a warrior and the gym is your domian, your battlefield. Show us why God made you a man...validate yourself. This is your lifeline. It gives you reason for existence. Strap in, dig in, clench your teeth, and go. Once back in the game you'll thrive.
Good luck MI.