Surely He has borne our griefs (sicknesses, weaknesses, and distresses) and carried our sorrows and pains [of punishment], yet we [ignorantly] considered Him stricken, smitten, and afflicted by God [as if with leprosy]. [Matt. 8:17.] But He was wounded for our transgressions, He was bruised for our guilt and iniquities; the chastisement [needful to obtain] peace and well-being for us was upon Him, and with the stripes [that wounded] Him we are healed and made whole.(Isaiah 53:4-5 AMP)
Since your right standing with God and your healing are both in the same redemption package, if you are have trouble believing you are righteous you will also have trouble believing you are healed. Same package, same faith. This new righteousness is your nature. Healed is who you are, and you receive it with the same faith that saved you. This video will encourage you in using that faith.
Take Psalm 103, verses 1-5 and meditate in what it says: Say it out loud” I will not forget any of His benefits. He forgives all my iniquities and heals all my diseases.