When you approach God you just love on him and then thank him for what he ALREADY DID FOR YOU. I Peter 2:24-"By his stripes you WERE HEALED." You receive healing because you relate (come to him) in Christ (in the Spirit) not in how good or bad you are (has nothing to do with that). You get it because Jesus got it and its you’re for the taking. He wants you to have it.
Read Psalm 103-You have a benefit package when you accepted Christ-just as real as the one you get at work. “Don't forget his benefits” Psalm 103 starts out. “Come boldly” God said. And if you struggle, do what the man who was struggling to believe for healing for his son did, pray this “Lord, I believe please help my unbelief.” I do that on the occasion when I am struggling and then I push forward and Gods helps me the rest of the way.