When my depression was at its height I can remember looking at or listening to things that would normally have made me excited or moved and ..... nothing, just nothing. I think it is part of the illness - you just feel "flat." I thought it was interesting that rather than just feeling flat, there was my "other brain" looking in and observing the fact that I felt flat - fascinating.
I hope that you will regain the occasional thrill when you have had a chance to unwind.
Army horses loose on London streets