Welcome to a large and very non-exclusive club!
That said, I would add from my experience: take it one step (or procedure or issue) at a time. Make your decision and then once you have results from that make another decision. Don't race ahead of yourself. Learn to wait till it is time to make decision after decision on the facts of your case. (Don't make flow charts/ decision trees or whatever they call them - you know if it's this then I'll do that). The process of diagnosis and treatment goes sort of slowly anyway, and you will have time to consider and make the best decisions for yourself .
And keep us in the picture!