Divine Healing V - If God wants to heal me, why then I'm not healed?

Many people believe that God wants to heal, but they stumble with the question: Why am I not healed if God wants to heal me? I think that the question gets difficult to them because of:
- Assuming that if God wants something, then it definitely has to happen.
- Assuming that if God wants something, then He has to do it.

If God wants something, is it going to happen in any case?
Unfortunately, the answer is No. How good it'd be that always the will of our Father be done!, but it's not so. I k...