Generally after doing single sitting rct some time it's cost pain, I advised you wait for some days and do take your medicine crown should be placed only after pain goes, don't put it on under pain, some time there mit be some infection which cause pain,
Next Steps
please do consult your dentist regarding this, or you can consult me if you want.
Health Tips
have a light food don't press much on it, but brushing has to be done don't leave it in fear of pain