So I both tried to tune into your health issue myself, and I took it to my roommate who often gets spiritual insight into such matters. I got nothing (but maybe a block), but my roommate got that for you it is an issue of belief.
My roommate, however, also suddenly made a connection on what belief doesn't mean but is pushed by some faith healers. It isn't a matter of 'just believe hard enough' with enough effort or something, but more light and easy like a child just knowing that mom is going to feed him today.
I can't say I had it perfect myself, but when I was in college, I was just walking up the hill to class when I suddenly realized I had never asked God to heal my lifelong tendency toward migraines. I believe this was Holy Spirit suddenly pricking me, maybe even a response to someone praying on the campus of my Christian school, because it was really out of nowhere. Anyway, I did believe that God could. My doubt was more a question of if God would be willing to do such a thing for me. I then thought of the story with Elisha where there was a woman who had prepared a place at her home for Elisha to stay whenever he needed, and the prophet wanted to give her a blessing in return (2 Kings 4). He therefore told the barren woman that she would have a baby, to which she said something suggesting she didn't want to be teased with getting her hopes up falsely. Therefore I told God that I was making my request known, but like the woman in the story I didn't want to be teased with false hope, so I would not be repeating my request. I went on my way and largely forgot about it.
Then about 4-5 years later, God had introduced me to a new fellowship and early on I was offered healing for not only my migraines but the social anxiety for which I was content with my Prozac as treatment. God apparently was not content, though, since psych meds interfere with one's ability to hear the spirit, and I was pronounced healed of both at the same time. One significance of this was that the anxiety issues immediately disappeared, but the migraines took a few more steps, but ultimately were healed too. The instant healing of my anxiety helped me to believe through the process for my migraines.
As I now have a lot more understanding of such things, I can now explain to you that faith is a needed resource for healing. If there was a surgery that could cure you but it cost $50,000 you might have a wealthy person sweep in and pay it for you, but chances are it wouldn't happen unless you provided the cash yourself. Healing is a little like that. Sure, occasionally someone else might be able and willing to pay the cost for you, but your best chance of being healed is to pay your own way. Even Jesus went around singling out those with the faith to be healed. Consider the lady who got healed just by touching the hem of his garment with the faith to make herself well. He didn't even know who had been healed till she spoke up to admit it was her.
I also now get that, yes, God can say 'no,' but at least to His faithful children He always gives the answer of what is best. If He says 'no' it isn't because you aren't important enough to consider but because there is a real reason not to, and if that reason changes, He is likely to then say 'YES!'
P.S. Sorry if this was a bit rambling. I had lots to share but not a lot of time to organize my thoughts more clearly.