When was the last time you went out for a recreational/fun evening - or even a nice meal with your dh or friends?
Can you afford a babysitter? If so, get one so you can go out with pals, or with dh.
Do you do anything for yourself? Even if it is only an hour a month getting a pedicure, you need to do something.
What interests you? Can you find a way to do more of it?
Regarding today - go outside with the kids. Fresh air and a change of scenery will do you all good. It will also get you out of the house (obviously), away from the computer and away from the junk food. Time will go faster too.
If weather is grim, go visit a friend or invite friends to come to yours for a cup of tea. Companionship can help.
How old are dc, and how many?