Hello, Thanks for the query. I know it does lead to anxiety but frankly speaking ,it is unlikely to cause any perforation or any problem. Just take plenty of fibre like salad,banana,apple and drink plenty of water. You can take big corn meal also and then you can come to know that piece  of plastic has passed,once you find corn in your stool. However if you feel that that there is sharp pain in abdomen or bloody stool,then you may think of going to the ER. In all most all probability,nothing is going to happen to you and this piece of plastic shall pass. I hope it helps. Best of luck Thanks