Stress burns the mind in the same way as physical activity burns the muscle. At some point you need to give your mind a rest. I suggest this book:
http://www.amazon.com/Full-Catastrophe-Living-Wisdom-Illness...
or this one:
http://www.amazon.com/Wherever-You-Go-There-Are/dp/140130778...
This should help you keep your strengths intact regardless of your current situations ... who is to say that next endeavor will be better than the previous one.