That sounds a lot like some of my depressions, though I have also heard people say that their medications can cause emotional numbing and anhedonia too. So I cannot say exactly what it is, only that it would be worth discussing with your pdoc. Unfortunately, I haven't found anything that helps when I experience those symptoms. They go away when the depression lifts. It seems likely that what you are experiencing is reversible-if it is the meds, change things around to avoid that side effect; if it is depression, treat the depression or wait for it to pass.

I hope this helps a little.