Yes, your feelimgs are very common. Yes, I have experienced the same. I think they come about b/c we get on what we think is a roll of good things. So, when the stop (unexpectedly for us) the reality smacks us in the face. Its also a result of having expectations and not having patience. Oh, and it means you still care.
Those are the same things I have experienced. Don't dwell on the one or two negatives that came after a bunch of positives.