I can definitely relate to this feeling - there are times when it seems like the only reason I can hold things together is because there's just no choice about it. As soon as the deadline is passed or the trial is overcome, I sometimes get physically sick, usually a cold or sinus infection. Usually I feel relieved, but am so drained that a bit of depression follows.

Give yourself some time and space to recover from tough times. Stress does a lot of invisible damage that can take awhile to repair. Hang in there!