Theoretically I could call to schedule the next appointment, and I might even do it but there's a good chance that if I call at all it will be like 3 months to 3 years later. :|

Even if you think you'll need to reschedule, I find calling to reschedule something on the books to be easier than calling to schedule something in the first place. (and if you do have to call to reschedule, do not get off the phone without the next appointment being on the books!)

And set your calendar to remind you multiple times. I will do like 3 different reminders. Often I choose: 1. The week before 2. The night before 3. The morning of 4. An hour before if it's later in the day

This feels like it's overkill, and it often is, but occasionally it has saved my ass. :|

In short, DO NOT LEAVE! Lol

YMMV but this helps me so I thought I'd share!