Sebastian,
I wish I had great words of wisdom for you, but right now just have some commiseration...I too miss those feelings of being happy and productive on adderall....The enthusiam, the being interested in things. I try to remind myself, though, that it WASN'T real, and that it wasn't sustainable. And those things were only at first. Three years later, there was a reason I wanted to quit this drug. I was crying every day. The 'up' would always eventually end with a crash.
And, after quitting, the months of flattness and deep depression and/or anxiety were very real, just like tons of other people's posts here describe.
Now, for me, the depression isn't so bad, the anxiety isn't so bad. But the flattness, the boredom, the ennui, the ahedonia...yeah still dealing with that. Everything is very slow.
A doctor told me that while it takes days for a cut to heal and weeks for a broken bone to heal, it can take year for a brain to heal. I just keep trying to focus on that.