One's healing does not lie in their faithfulness to God but God's faithfulness to His word. I, we, need to go to a place of "If its His will" to "It is His will" because there in lies the problem. If we don't know if our heavenly Father who loves us so very much wants to heal us, what does that say about God? It has nothing to do with sovereignty and everything to do with His love and Jesus. God in His mercy may heal you based upon your hope that He will heal you, but you can also go and embrace His grace and see that He already has healed you in Jesus Christ.
One is certain and another is a hope that God will just do it. One says it is done and the other says, "It can be done." One accepts what Christ's beating has accomplished on their behalf and for their mortal bodies and the other bases their healing in the hope that God will do it regardless of their acceptance of what Christ has accomplished on their behalf. Neither is wrong, but one of them has a higher yield. While one is based in chance, the other is not. It is based upon the actions of Jesus thousands of years ago.
So while our faith may say that I believe God heals today, it is another matter to say that I believe God has healed me (past tense). You have to speak life, speak and echo what God says about you. If He has said that by His stripes you are healed, then echo it. Say what God says about you. I am healed, in Jesus name (for by His stripes I am healed). We can hope for healing, indeed I do. But we must go from a place of hope into faith if we wish for a more certain answer and manifestation to our desire to be healed. I am not saying your hope is in vain because God honors such hope because He sees you rely upon Him. However, faith takes grasp of the healing while hope is more passive.
This by no means is meant to offend or question your faith; it is more along the lines of redirecting the faith. You have the faith, it only needs to be aimed at the right source. Jesus.