It is easy to believe a spiritual practice will help you feel better. But from my experience, spiritual practice necessarily cannot concern how you feel.
Today I remember that sometimes I will not feel like engaging in the sadhana which is set before me. Yet, each day I do it. Sometimes I am sleepy, sometimes I feel listless. I experience the practice with those feelings. Some days I am motivated, some days peaceful, and I experience the practice with those feelings too.
A spiritual practice gives clarity to the inner world of emotion through its consistency among the fluctuating and fleeting nature of feelings. It shows up emotions for what they truly are: not you. Anything changing cannot be you, rather you are here experiencing change. Doing the same spiritual practice each day gently lays the ephemeral at the feet of the unchanging consciousness that you are, lets you gaze upon it, and do with it what you will.