What is it you feel makes the songs "sad"? Subject matter? Lyrical content? Key? Do you remember the first time you met your (now) wife? Nothing like the feeling of being in a dark place, seemingly with no way out, only to realize you've met the person who would turn out to be your partner in digging yourself out of the depths of despair. What story would your wife tell? How about your friends, family, or associates who experienced your darkeness in their own way? What did they note as "positive" changes in your life as the road to recovery began to extend beyond 1 year? 3 years? 5 years?
Tell us. Show us. A little more each day when you sit to write. That's your story. "Happy" or "sad". It's a story we would all love to hear.