Thank you for your query at AskTheDoctor.com
I understand your concern.
With a previous history of kidney infection, it is better you consult your Physician and get a CT KUB done to find out why you have not been able to urinate.
They can catheterize you if you are in a lot of pain.
Naproxen sodium will not cause such difficulties in urination, so it is unrelated.
They need to rule out kidney stones, UTI, cystitis, e.t.c, all of which can cause similar symptoms. If it is due to severe UTI, a course of Tab. Cotrimoxazole ( TMP-SMX ) twice daily for 7-10 days will be helpful in resolving the infection. Also, increase your water intake to a minimum of 3-4 liters per day.
Hope this was helpful,
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