I experienced a sudden ripping pain from solar plexus to sternum after coughing. it only lasted 20 seconds ans hasn't come back. is this likely a symptom of an aortic dissection?

Less likely: If caused by coughing much more likely to be muscle related. An aortic dissection would more likely have searing pain through to the back and you'd feel unwell. There is also the possibility of referred pain from lung or other structure so best to have an examination by a doctor of your chest and upper abdomen and if doubt remains tests can be ordered. Check urgently if breathing troubles