I was taking aleve (naproxen) for the past week for back pain. i've stopped taking pain relievers for the past couple days because of dull stomach pain & mild nausea. did pain reliever hurt me? how can i fix it?

Maybe: Try an otc anti-acid drug, a ppi like omeprazole.

See below: Nsaids can easily irritate stomach, especially if taken alone (without food). In future take meds (unless directed otherwise) with full glass of water after a meal to lessen effects on stomach. Otc acid blockers like zantac/pepcid or prilosec/ Prevacid (lansoprazole) for a week can help; if symptoms persist, or if see black, tarry stools, see fp right away for evaluation & treatment.