This could well apply to me. Is there any way back from this, it's like having the(or some) knowledge and experience of the spirit world but rejecting the actual call to Christ...
You become a spiritual dwarf as Billy Graham once said - in general.
You are misunderstanding the passage, so lets break it down so we can better understand it.
All Scripture is quoted from the King James Version.
Hebrews 6:4 through 6
before we can break this down we have to go back to the verses before this:
Hebrews 6:1 and 2
This is important because we are getting away from basic salvation and into an entirely different phase of Christian life.
Verses 4 through 6 are now talking about living the Christian life.
What Paul is saying here is what Jesus was referring to when he said:
Matthew 7:21 through 23
So back to Hebrews 6:4 through 6;
This is a description of having encountered the Holy Ghost, been saved, and have enjoyed the blessings of God knowing that they came from God.
This seems to be where you have your misunderstanding: "to fall away" is not just missing something about being saved it is the opposite of that. In falling away you must take into consideration once enlightened which means you have fully realized your salvation and proclaimed Jesus as your savior, but then later deny that Jesus gives salvation
Since Jesus has already saved you where is another sacrifice to salvation again?