... I've cleaned for a month, still feel the same...
I can't remember off the top of my head (bad memory, my apologies) what you were addicted/dependent on, but for me, heroin PAWS caused me to feel that bad for at least an entire year after I quit and was on Suboxone.
I also realized last night that I have been so depressed for so long that depression has warped what I can enjoy. When movies, other people, music, environments, ideas, etc. - are perceived by me as overly happy, I feel like I can't enjoy it right, and it makes me sad because I am so depressed. I realized last night that merely being able to escape the depression perception is necessary to gain an appreciation for what you have in life.
It probably sounds ridiculous and a bit silly, but this has been going on as long as I can remember. Watching Disney movies as a child would depress me. When my parents would play popular music, it would depress me. When I went out and saw other children playing on a playground, it would often (but not always) depress me. It was like happiness took on a bittersweet edge that caused me more pain than happiness.
I wish I knew more about why this happened and what I can do to stop it, other than focusing on shifting my perceptions to perceiving happiness.
I don't know if anyone else here has had problems with this like I have, and I really hope someone else can explain to me if they have noticed this too or not. I feel like I was onto something by noticing this last night, and it gave me the opportunity to make my life better.