@Tom ****
I don’t know what you need? Identify a clinic , create a project, get a schedule/medical certificate at least 6 months stretched out- payment and receipt- clinic&doc certification all stamped and done - very straightforward.
My personal feeling if you suffer a cronical decease better go with that as it makes a years long investigation&treatment necessary just in case they change the rules or want after a while reevaluate the reason for your visa.