The notebook is an excellent idea. My mom has so many doctors that she started keeping an envelope for each one and takes the appropriate one with her. She also has a small purse which she uses only when she goes to the doctor (right now she actually has a girl's purse). I have expanded on her idea. Included in the purse are: list of meds( including doctor and dosage), list of surgeries, copy of Health Care Proxy, medical insurance card/info, and personal info ( her address,phone number,person to contact -elderly people get nervous and can't always remember this info right on the spot), list of doctors (just collect a business card from each doctor), and a small calendar for appointments (so t here is no conflict when making appointments). I have also started this with my dad (not with a purse but a zippered notebook type of thing).
When going to a new doctor, there is always medical history and summary to fill out. Make a copy of the first one, then you don't have to keep asking your parents for the info over again for each new doc. I have the office send out the forms to me ahead of time instead of doing it at the office.
We are at the point where I accompany my parents (I am able to do so because I was lucky enough to retire early). I always give my name and phone number for the doctors office to contact my parents. Parents sometimes get confused on the phone and I have an answering machine. I have also taken over her meds(this was difficult for her to accept) - filling in her weekly pillbox, calling the doc for a new refill,etc. Weekly pillboxes are a great help. When you visit, you can check to see if the pills were taken. Our pillbox has 4 compartments (breakfast,lunch,dinner,bedtime) because my mom has several meds to take at different times and it stays on the kitchen table.
To get your parents used to the idea of you going with them, go out to eat afterwards. It's a nice treat for them. Explain that by you going with them, you are able to spend more time with them and it's easier and safer for them.
If you cannot accompany them, get them the easiest recorder and teach them how to record the doctor visit. Maybe you could find a neighbor or check with the church, give them a few dollars so they can go and handle things and maybe drive, if necessary.
I know this reply is long but I have been going through all this and was almost going crazy. You have to put your foot down and be stern about certain things so that everything gets done smoothly for them and healthfully for you. I used to be a highschool teacher and find myself teaching again (repeating myself continually, giving directions,etc)!!!!!!! I am also single with no children. This enables me to do more for and with my parents (dad 93, mom 88). I do not know how married or single parents handle all this. My sister lives out-of-state.She gives me a lot of advice, visits every couple of months, and calms me down. We can now laugh at certain things.