How many of you feel a sense of doom coming if things in your life seem to be going to good?

It's been happening to me lately. I'll have a string of bad days but nothing horrible, then suddenly I'll have a couple really good days. I'll feel physically good, as well as mentally and emotionally good. Then, suddenly I feel a very strong sense of doom coming. Like this can't last for long, something bad is going to happen. Is this common? Do you think it could be a form of depression? It has only been happening for the last couple months. I don't really have anything to be worried about or depressed about but I'm guessing depression doesn't discriminate.
How many of you feel a sense of doom coming if things in your life seem to be going to good?
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