Here’s a definition of rotation that I think fits your context: “In medical education, a clerkship, or rotation, refers to the practice of medicine by medical students (M.D., D.O., D.P.M) during their final year(s) of study. ... During the clerkship training, students are required to rotate through different medical specialties and treat patients under the supervision of physicians.” So, for example, a med student might have a radiology rotation one month, a cardiology rotation the next month, and so on.
Regarding the other sentence, I think the author means: “Our culture already puts little value on some kinds of emotional pain (and expects people to be tough), so you can’t expect help from others for your pain; so don’t make matters worse for yourself by treating your own emotional pain as unimportant, so that you don’t even help yourself.”