Shaking does not affect this the way you think it does. You'll be fine as long as you wait like 10-60 seconds after shaking vigorously. The liquid and gas pressure inside will reach equilibrium, and no matter how much shaking you do, it won't degas further.

Also, keep in mind that it's mostly temperature and surface area that causes soda to degas (fall out of solution).

Fun fact: this is why paper straws are inferior to plastic straws for drinking soda, because paper is insanely more porous than plastic, and causes rapid degassing of the soda inside of the straw, rather than in your mouth, throat, and stomach. (There are other reasons, too, but this one is often not considered by most people)