This is a very common problem associated with pain killers. While pain killers are great for getting rid of the pain in the body, they come with the side effect of constipation. The pain killers slow down peristalsis, which is the natural movement in the intestines to move fecal matter down to the colon to eventually be eliminated.
I would continue with your blasts, water intake and try and taper off the pain meds as much as possible. Once those are out of your system, which could take a couple of weeks, your bowel regimen should return to normal. Additionally an enema can help breakup some of the hardened fecal matter, and help you pass it through the GI tract and eliminate it. Give it a try!
Here are some Blasts for constipation that you can try: