Pain on both shoulders. Medicines?

In last week, for internal excruciating pain on right shoulder and adjacent hand region, doctor gave these medicines: Polybion L, Nurokind G, Zerodol TH4, Pando DSR. Her BP at that time was 108/70. Doctor told to eat properly, which she had been doing regularly. She was good for 1 day. Again from today morning, she is having internal pain on her left shoulder with tingling mild burning sensation. Cracking left hand finger sends pain signal to her left shoulder. Please provide suggestions what to do with the pain. Do we need to consult any specialized doctor? or normal medicine doctor will suffice? Why this kind of pain keeps happening? As she is a MSc Zoology student, there are very heavy books which she need to carry from college library to and from home. Can this be the reason? If so, why the pain persists even after last week's medicines? Please advice.