Yes, i get this too. i have found that several things help:
1. getting regular exercise. tho i have been neglecting my bicycle of late.
2. eating a well balanced meal at least once a day, cutting down on gluten and dairy.
3. Yoga, (or any other type of meditation wld do).
4. recognising and minimising stressors in your life.
5. Really listening to your body clock and not trying to over-ride it. I really wish that I could have 10 hours sleep a night, but I have realised that I can only function if I get around 8+ hours.
6. In spare time make sure that you do a few of the chores before you get on with leisure activities. (That way my flat doesn't rebel and attack me when i least expect it).
What is GAD?