I'm dealing with constant health problems, of all sort, for almost five years, and I'm asking somehow the same question, but I still believe the universe has some grand plan, just that it involves us directly and it changes every second. That doesn't make me lazy though. I believe that no matter what the problem is you should try your best and thereafter let the universe do his job. Not doing your best is understanding the universe wrong, in my opinion.
Life is full of possibilities and it will be such a waste to quit trying. Even when it comes to health, you never know. I know many stories where people are healed from their illness because they don't quit trying. They constantly fight for life and it's admirable. Perhaps the universe was meddling into their problem, I don't know but it continuously amaze me despite being a skeptic. I hope you will soon healed too.