Taken from a small booklet titled "Healing Scriptures:  Powerful Promises for Divine Healing" by Joseph Prince.

A PRAYER FOR HEALING

"My friend, whatever your medical situation or challenge would you pray this prayer with me?  (If you are praying for a loved one, just say your loved one's name as appropriate). Say this with me:

"Dear Lord Jesus, thank You for Your love for me.

"Thank You for showing me in Your Word that You want me healthy and strong and that You are my healer. That You are not just able, but willing to heal me and give me a good, long life.

"Whatever challenge I am facing right now, I know it is not too small for Your attention nor too big for Your grace and power.

"I see it completely covered by Your perfect and finished work at the cross. And because of the stripes You bore for me, I declare I am healed.

"Thank You that as I meditate on Your healing promises, according to Your Word, they are being made life and health to all my flesh.

"I declare that Your Word is working powerfully in my body, healing me, protecting me, restoring to me, and invigorating me with Your resurrection life. I thank You that it is also bringing peace, soundness, and strength to my heart, my mind, and my emotions.
Amen!"

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Prince has a medical disclaimer to remember there are lots of ways that God can heal. And they may include doctor appointments, medicines, various procedures, and surgeries. Don't discount those as aiding in our healings as well.