Do you think you can begin getting involved in new activities where you can meet new people and build up the good feelings again?
A few months ago I pushed myself to begin doing more for me, and Im beginning to feel some returns on that investment now. More confident and better about myself. Try a gym, yoga, an art class? Something to lift your spirits.
Id also say a therapist might help you work on the loss of the marriage. Its been something helpful to me in the past and Im looking to start again.