Dear sister,

Let us claim and stand on God's Word/promises (NKJV):

    
But He was wounded for our transgressions,
He was bruised for our iniquities;
The chastisement for our peace was upon Him,
And by His stripes we are healed. Isa. 53:5

    
who Himself bore our sins in His own body on the tree, that we, having died to sins, might live for righteousness—by whose stripes you WERE healed.

1 Pet. 2:24

Is anyone among you sick? Let him call for the elders of the church, and let them pray over him, anointing him with oil in the name of the Lord.
    

And the prayer of faith will save the sick, and the Lord will raise him up. And if he has committed sins, he will be forgiven.

Confess your trespassesfn to one another, and pray for one another, that you may be healed. The effective, fervent prayer of a righteous man avails much

Jam. 5:14 -  16

So Jesus said to them, “Because of your unbelief;fn for assuredly, I say to you, if you have faith as a mustard seed, you will SAY to this mountain,
 ‘Move from here to there,’ and it will move; and nothing will be impossible for you. Matt. 17:20

(disease in your case)

One pastor mentioned that a Christian sister prayed for healing for some time but she was not healed. . One day she was told by Holy Spirit to use some exact words to speak to the disease (mountain). She was healed after that prayer.

Some pastors and  preachers told the sick to renounce/remove/discard  any talisman, charm, amulet, objects or books/practices which may harbour evil spirits or break curses/spells (e.g. resulted from idol  worship of ancestors, or from other people) through the BLOOD of JESUS.

One preacher said that out of 10 sick Christians, 9 should be healed. It would be good if we are healed immediately after prayers. Sometimes, the healing could come gradually or at a specific time later. Some preachers would encourage believers to hold hands when  prayers were said as God's people released their faith together. Praise God! Jesus heals!  I was healed of a skin problem (i.e.  a small dot of thickened skin on my forth finger).  (Before that I used   2 chemicals  from a pharmacist. He said that no other chemicals could be effective. I also  tried  molten rock sugar, but  to no avail).  God healed me after many pastors (both local and foreigners - white, yellow and dark skin) prayed .

Have faith in God and Jesus.

BIC - Andy G.