There are three things a Christian needs to do, in order to be blessed in their finances. The first is tithing. The second is giving offerings. The third is living within a budget. Several Christian pastors have done teachings on this. Look up Robert Morris and Rick Warren.
I don't know what's wrong with your son, but has he tried any of the following? Ayurveda. Traditional Chinese medicine. Naturopathy. Integrative medicine. These four branches of health sure helped me. Some medical doctors (M.D.s) practice integrative medicine. You can find one on IFM.org Maybe he wouldn't need some of this medications. Good luck
Cabopolonio, I am praying for you