Fasting & Prayer
The flesh is at war against the spirit.
If you seem to have inner turmoil even after you have given your life to serve the Lord. If it seems like you can't get the peace, you desire, and you can't get where you want to be. You feel like you get some ground in the spirit but then fall to some sin. It's because you are giving into the flesh. The sensual nature of sin is taking over your mind, through sex, eating, drinking, and all of the appetites. These appetites of the flesh when indulged in close out the hearing of the spirit. That is why you get times of hearing and joy but then fall back into depression and conflict when the flesh takes back over your mind. You either eat from the Tree of knowledge of good and evil, or you eat from the Tree of Life.
Sorry to say that most people are eating from the Tree of good and evil. That is why there is so much sickness among Christians. Fasting is the remedy to shut down the flesh and hear the spirit. Glorious truths and freedom will be gained if you fast and pray.
What wears people out and takes away peace is being constantly concerned with the appetites of food and sex. Those are the biggest. When the spirit of your mind does not control these or is not placed over these, you will inevitably experience burnout, especially if you seek God and the things of the spirit. You will begin to experience more conflict within because the flesh is at enmity with the spirit. This creates conflict inside. Fasting and prayer is the way to put the appetites down and allow the spirit to come above them. It causes rest and peace to come because the spirit reconnects you with the wonderful Tree of life. This knowledge is the True knowledge and bread from heaven. When your appetites consume you, your knowledge is always filtered through the Tree of good and evil, with the occasional glimpse of light slipping through to give you a taste of freedom, then going back to what feels like bondage. You don't have to live like this. Jesus and many of the great people of God taught us that fasting is the quickest way to put the flesh down and receive power from the spirit that can even work miracles.
Get these books to learn how to fast correctly.