Had stent placed in diagonal artery 6 weeks ago. sharp pain in that area when turn on left side at night. is this normal?

Stent: What you describe is likely a musculoskeletal pain. There is little likelihood that such a pain is related to coronary artery stent unless some position on the cath lab table caused some intercostal or costochondral irritation. This wouldn't directly relate however to the heart. To be safe you could call your interventionalist and ask the question.