HI I Am Waiting To Get Into See A Specialist

HI I am waiting to get into see a specialist in regards to my arm and have been put on Napraxon I learned recently that i may be on this for up to 18 months> in my last doctors appoitment i asked about the naproxon having long term effects so they prescribed me pantoprazole. I just read that long term use of this drug can/may cause stomach cancer. if this is the case shoudl i be taking this drug with napraxon