( I have one myself that is incurable or as of now has no earthly cure, it's called Crohn's disease). Those with those problems often blame God, get angry and are hateful toward God and everything else. I'm not bitter at God for my disease and just because there is no known cause or cure doesn't make me blame God for it. It happened.
I truly believe God can do anything. Salvation, healing, answer to prayers, or the Holy Spirit all do not conform to the laws of nature. Just because a person does not get the particular answer from God doesn't mean God fails.
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I'm sorry that you have these health issues, I truly am.
But the Bible plainly states, "Ask & ye shall receive". It doesn't say you might receive. That would cover someone asking for something in particular.
If you truly believe that God can do anything, & you've ask God to heal you of this disease, why hasn't he?
And if you haven't ask to be healed of it, why not?
My questions are not meant to be rude, I'm just curious.