you gotta take a holiday buddy, enjoy some of that hard earnt $$(remember, thats why your earning money in the first place)- take a holiday, as long as you need, get lots of exercise(workout, play sport- whatever), do what every you enjoy(if you like to toke every now and then- toke!) as soon as you feel motivated and ready to work, get back to work!
and while your working, take breaks, get out regularly and take time to enjoy life
you'll be right man