Exercise --- I'm less keyed up if I'm tired and sweaty
Distraction --- get out of the house, go see a movie, walk around the mall, clean out a closet, call a friend, anything that keeps my mind off my troubles. I try to make plans and follow through on them.
Focus on what's important --- do something fun and spontaneous with the kids, even just getting an ice cream or going swimming, etc. Brush the dogs, hug the cats, write in a journal, make my house look pretty, work in the garden....whatever is important to you and your vision of a "good" life
A good cry --- releases a lot of tension
Supportive literature --- I sit down and read something from Al Anon or read here on SR
Hang in there! I am having similar times, some days are good, some are OK, some are filled with anguish. Focus on One Day at a Time or even One Hour at a Time.
Also....if you're a woman, keep track of your cycle. I'm finding that my worst days are those prior to my period. Darn hormones!