If you would rather not do an enema, then a Dulcolax suppository may be more effective than a Dulcolax or a glycerine suppository. Miralax may also work better for long-term management, although it typically does not offer quick relief. increasing fiber intake is also important for constipation and for IBS, but also better for long-term management.
Regardless of which laxative is used, it is also helpful to be drinking plenty of fluids. When the body needs to hold onto water, it will absorb water in the colon, making stool harder. So assuring a high level of hydration will limit how much the colon absorbs water from the stool.
Percocet, like all opiates, are constipating. So if the kidney stones are a recent acute problem, the addition of Percocet may be the immediate cause for worsening constipation. However, once the kidney stones are passed or at least causing less symptoms, if you can limit the amount of Percocet being taken, that can help the constipation.
If there is some discomfort, it still would not require immediate medical attention. It would only be needed for significant pain or vomiting.
If I can provide any additional information, please let me know.