What he was referring to is the fact that sub has a stronger affinity for those opiate receptors than other opiates do. It will push other opiates off the receptors and it will stick to them no matter what else you take and so it will block the effect of other opiates. Opiate receptors affect a lot more than pain. They are involved with motivation and emotions in ways that aren't fully understood. Sub is only a partial agonist. This means that it will stick to those receptors but will only partially activate them. So it is going to partially affect your motivation and emotions in complex ways. I find it difficult on a daily basis to deal with some of those effects.When we used drugs we fully activated those receptors with each dose and then as we abused drugs further we developed new receptors to activate. If you've done enough damage to your brain chemistry to really need suboxone I think it's a long road back to ever being able to feel things like you used to and to have the motivation to do things that you used to have. Good luck.
I used to. Its because your body and brain are still getting the opiate. Until you are clean of all opiates, you won't have those same emotions or feelings. They need to be out of your system for a while for those feelings to restore to normal. It takes a while, trust me. But it absolutely can come back. Stay positive. Good luck.