I think this is quite common actually. I call them anxiety spikes. If you're susceptible to them, they can happen over anything, even tiny relatively unimportant things. There is usually a strong physical reaction (racing heart, prickly forehead, shallow breathing) which can take a while to subside.
A very good technique for this is to keep a notebook where you log each time this happens. When the "issue" is resolved or has progressed to something else, you add a note to end of the relevant entry. Then from time to time you look back over them and (hopefully) note that the terrible things you were worried about usually / always didn't come to pass, or that you simply stopped thinking about it.
CBT is very good for this kind of mental health issue, so if you find it getting out of hand (like it did last year), then that's something to look into.