So there's an interesting situation that I have with my dad. I'm going to try to explain it as clearly as I can. This should be on-topic here, as per https://parenting.meta.stackexchange.com/a/227.
A little background: I'm 21 years old, and live at home (when I'm not in the dorm in college). It's a process, but I'm trying to get my dad to understand that I'm not a little kid any more. He was an only child, and his parents doted on him very much; I'm sure it worked for him. I, however, feel like I need a little more room to be independent, and I have been trying to work this through with him and my mom.
Here's the new situation that I'm seeking solutions for: last week, I saw a psychiatrist after nearly failing a couple of important classes in school (I'm usually a good student), and she diagnosed me with ADD and mild depression. I'm pretty good at science and internet, and I am going to do my own research on what ADD is and how to work with it (besides seeing a therapist, as the doctor recommended).
What's bugging me is that my dad is trying to take care of this for me. I was diagnosed with type 1 diabetes when I was 5 years old, and, understandably, my dad read every book that was available so that he could take care of me. That was appropriate when I was five, and I really appreciate that he cared that much to thoroughly research the disease beyond what the doctors told him. At this point, I manage my diabetes entirely by myself (and have done for a few years now). I do not, however, think that it is appropriate for him to try to micromanage his 21 y/o son's new diagnosis in this way. Just today, he told me something along the lines of "I know you like running, so I want you to run every day while you're on vacation. I read that exercise is like medicine for ADD." I think that's over the line of how involved he should be (and also has the effect of making me not want to run).
I want to figure this out on my own, but I also want him to be there for support and answers to questions if I need it. What's a good way to try to get that across to him? He can get pretty upset if he feels like one of his children is "telling him what to do/how to parent;" his old-school parenting doesn't have much room for customer feedback. (He's in his fifties.)