Hi MM and welcome.
If you have not any symptoms for years, and have not had a recent check up to rule out anything physical that could be causing this, then I would make a call to your doctor to be on the safe side.
However, if anxiety symptoms are common for you, and you are otherwise healthy, then I can suggest the coping skills here on this site.
http://www.stress-relief-exercises.com/
I hope that this helps and that you are feeling better soon. Post with us anytime. We understand and are here to listen and support.
Scaredy Cat