I think that constipation can be the result of many reasons, too many to mention. Even if you are having some bowel movements it's never complete and you can feel that you're not empty which is very unpleasant. I take a medication that's know to cause constipation and not even laxatives are very helpful, I recently started using Metamucil, a fiber mixture you add to water, it's been around for many, many years and it's fairly helpful but even with the added fiber you still need to drink lots of water and eat lots of fiber in your food, starting with fruits and vegetables. It might take some time for things to go back to the way it was or perhaps it's a change within your own system, good that you've been for help to rule out any other possibilities, that should always be your first step, good luck with everything.