If I were to reapply next year to the same medical schools, both MD and Do, do I have to redo all the application process, including secondary applications?
Yes you do have to redo everything primary and secondary and their fees.
It is highly advisable you have more on your application the second time around and this goes without saying however DO NOT copy/paste essays and alike. Adcoms can and will compare your applications to see what you have improved.
Keep a list of the schools you applied to the first time around. You have to mark if you have applied to schools before.... There is a box you have to select "Yes" for "Previously applied" for each specific school.