Yep, opiates will do that. FWIW, after my faceplant, I got way more relief from Aleve than from the Vicodin that they prescribed, though I didn't have any fractures. MJ is a good suggestion, or failing that, at least add a stool softener or Milk of Magnesia, they're pretty benign.

The second and sometimes third days are usually the worst ... hope you're hanging in there.