
I had a post similar to this, although it wasnt my job that was keeping me down in the dumps.
Everyone here gave some really good advice, as to what to do to help. Spent time with my dogs, went for a dog walk (without the dog). That one was great. What I thought it meant, was walk slowly, enjoy the scenery around, and stop and just sit on a bench every so often. Really brings you back to nature, and its a good time to think.
I sometimes will put on a CD as well, and just crank it up! Then when I sing along, no one can hear me! I try to do that only, when my neighbours arent home. As I dont want to bother them.
Also, a Triple B Treatment. It used to mean Booze Booze and Booze, but since I am trying to cut back on drinking when down in the dumps, it means now : Bath, Book, Bag of Chocolates (like hersheys kisses, or M&Ms) dont just eat the chocolate either, let it melt in your mouth.
Also, my vocal therapist, did this one exercise with me, about relaxation. Its called PRT. You start stomach breathing, and as you exhale, focus on it relieving stress. Start with your left ankle, release the tension, and continue up the leg, then move onto the other leg, and continue until you have done your whole body. If it works right, you will feel about 1 million pounds on your bed (like you cant get up) because your muscles are so relaxed. Then when you do get up, you will feel so high (like a good high, not a chemical one). Its great. There are some really good websites out there, with practise scripts. Just search PRT.
Anyways, hope things cheer up for you soon.