Hi i am Dr Ahmed Aly
thanks for using healthcaremagic site ,
I had gone through your question and understand your concerns ..
I dont think your medication is the reason for your back and
shoulder pain.
i think it is a kind of muscular spasm due to overusing , heavy lifting , bad sitting and sleeping postures .
For now i may recommend painkiller like
advil tab when needed , hot massages with topical gels , muscle relaxants and some B12 vitamin supplementation will be effective also
physiotherapy and even
yoga are very helpful .
If pain persists i suggest some lab investigations , X rays and
MRI and visit your physician
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Any further clarifications feel free to ask.