Hello, Musicnmoods! It is difficult for me to say just how closely my experience of depression approaches yours. I've reached the point where something, either my meds or some psychological defense or both, truncates all my more intense emotions. My mind turns off both the unpleasant and the pleasant when they threaten to exceed the narrow range my psyche sets for them.

I do experience occasional explosions or, more often, "implosions," but those have become rarer with my withdrawal from society.

I guess my answer to you is that within moments of my approaching happy, my psyche reacts by flooding my system with anti-emotion antibodies. It has become automatic.