I accidentally swallowed one of those plastic gum toothpicks (1 1/2 in). one edge was pointed and the other side was flat. i started getting pains in-between my breasts and then an hour? later it moved down to my chest idk if its serious, wht do i do?

likely of no importance. If it made it into your stomach (you can swallow fluids easily) it will transit the gut & pass in 3-4 days. We have a lot of experience with similar items kids under 2 seem to eat at random. In the rare chance you develop colicky abdominal pain over the next few days see your doc. Otherwise I wouldn't lose sleep over the issue.