Hubby told me the other day he had a friend who was stuck in a rut. He asked me what he should tell his friend. I took a few moments to think about what I did to recover from break-ups and being stuck (I oftentimes over-worry and overthink things). I took myself to the time when I was recovering from a very bad break-up. I read multiple self-help books and kept praying. I was really down back then and kept to myself usually.
Aside from praying the one thing that helped me go back to being happy was counting blessings. I picked it up from one of Bo Sanchez' books. At first it was difficult to even think of one blessing I received in a day. Bo pointed out that one should start with very simple blessings, like waking up to a new day. Hearing birds chirping. Seeing a nice colored leaf. Drinking a glass of soda. Any mundane thing can be a blessing. My list grew from one to two then three, five, ten to thirty etc. I was feeling a lot better already when I was able to reach ten blessings per day. I just made it really simple for me to recognize that everything is a blessing.
I do still get myself in a rut. Usually happens when I'm very stressed and when something doesn't go as planned. Sometimes it takes days/weeks for me to go back to my usual self, but when I start counting my blessings I'm usually back to my normal self in no time.
Try it :) It'll do wonders to your mood :)