Couple of things occur to me.
It takes a while for the anti-depressants to kick in. It took over a month for me. Even then they're not supposed to make you happy and cheery all the time - just pull you out of depression.
Maybe the blah thing comes about because you were relying on alcohol to give you the 'up' times in life. When you're sober you have to make those 'up' situations another way.
Lot's of times I'll use music that lifts me up and makes me want to jump around - I can't really call what I do dancing. LOL