Actually 7up is probably better at keep you UP then something stronger since that stuff is categorized as a "depressant" for a reason...but I know what you mean...however, I found sometimes it was better just to have my self a good cry...then dust myself off and jump back into making my happiness plans!
Sometimes it was watching "What About Bob?" or some other crazy, stupid, funny movie...or going to get a pedicure...or having a lunch date with a friend that maybe I had not seen much of...or just spending the time to fix a really nice dinner for me and the kids to celebrate OUR life together!
It is tough...don't think for a moment I have forgotten that...everytime I hear of another friend whose marriage is breaking apart...I cry...because I feel their pain!
So...maybe a good cry is what you need, then a nice shower (can be done at the same time too), then pop open the 7up and "heads up" !...on with the day...and too bad for everyone else!