Okay--I am going to be the first suggestion here. My one and most important tip would be to WRITE IT DOWN. Keeping an accurate log of doctor appointments, questions for your care team, and what responses they give you is a must. Not only will it give you good order in your treatment/care, this gives you a working diary to help you plan on what questions and concerns you have. The information is in a safe place and not circulating in your mind and creating an anxious anxiety condition.
Now you have my ONE THING--What is yours?