Thanks for posting your query.
Your back pain
seems to be muscular due to sprain
& strain which can be predisposed by obesity, however statins you are taking can also cause muscle ache (myalgia/myositis/rhabdomyolysis
). You should immediately talk to your doctor about this side effect.Elevated CPK or creatine
kinase can be a clue to investigate muscle injury.
You can apply ice over pain area and take over the counter pain killers naproxen/diclofenic.
Avoid bad posture and any stress.
Hope it helps.