I try to boost my mood when feeling really low.Deep breathing,meditation,prayer,stretch, aromatherapy,walking,talking to myself ,knitting and other crafts,writing,reading,just sitting with out any thoughts,imagining a good future,smiling at people things like that.If cannot avoid ruminating about past,I just let my mind wander,let the sadness build up then I cry and wail until the burden on my heart is lifted. Crying once in a while brings me great relief,but I only resort to it when all positive actions fail.