Hi Hard24Get,
This is a really appropropriate thread, since I begin day 1 of my retunr to MS3 TOMORROW! I would also appreciate any contributions from other posters.
From what I've seen so far in MS3 Orientation, the new MD third years are still pretty nervous as well, so remember anxiety is just a normal response. One thing that helps at my school is we have "Longitudinal Clinical Clerkships" during our PhD--that way we do a weekly half-day of clinic so we don't forget how to use our stethoscope! Volunteering at the student-run free clinic might also help. Since you're nearly done with your PhD (Congrats btw!), your best bet will be to work with the Dean's office in CAREFULLY scheduling your return--try taking electives and lighter outpatient clerkships when you re-enter. Your school should accomodate you in this situation.
I'm beginning with electives in Endo and ID (which I thought would be good to review basic, common problems). I then start my first clerkship in Family Medicine.
Good luck

You're almost there! I'll try to post more as I learn more!
Stay cool
🙂