The scriptural answer to healing shows that
symptoms did not alway disappear immediately,
even when Jesus ministered to the people.

The nobleman's son in John 4 "began to amend,"
improve, get better, convalesce, at the seventh
hour, when the fever left.

The healing of the blind man at Bethsaids, in
Mark 8, was not only gradual but in three stages.
So we may experience similar types of healing
depending on our knowledge and faith.