hoping it gets better

had a bit of a rough gf wknd, hoping for a good gamble free week... it will be a busy week which is a good thing, lots of work and things to do, things to think about and plan.
I still dont know how much of my negative mood swings come from the "withdrawal"... when I stop gambling I tend to have big mood swings, can feel really good and then get really low... when I gamble, I guess its similar but different, I get excited and happy at the start and then inevitably the disappointment and sadness comes. My wife said something the other day, she said I never get like super excited or happy - I had to stop myself from saying that I do when I gamble. Is that a common problem? I didn't even think about that before, have I lost my excitement to do everyday things? Does nothing get me excited except for gambling?
I am probably overthinking it, I still get excited, there are lots of things I enjoy and love to do, I am just not an overly emotional person and don't display it outwardly a whole lot...