I second (or third) the recommendations of seeing a psychologist and upping your level of physical activity. Try to find a psychologist who isn't a pill-pusher. I also recommend the books "Feeling Good" by David Burns and "The Highly Sensitive Person" by Elaine Aron. One thing that helps me figure out if I'm ok with where I am and what I have is imagining that I'll lose it tomorrow (not in a bad way). If I'm tired of where I live, I imagine I'm moving tomorrow, if I'm unsure about my job, I imagine it's my last day here. It helps me appreciate the good things about my situation. However, I'm definitely one of those people who doesn't appreciate what they have until it's gone.