I've been diagnosed with slipped disc and prescribed naproxen 2x 250 mg twice a day, so 1000mg a day. After a week another doctor prescribed me 500mg tablets and because I didn't realised i was still taking 4 tablets a day, so 2000mg a day for 5 days! Until now, when I just noticed. I haven't noticed any side effects or anything but I'm worried now that it was too much for so long and I can have some "invisible " side effects?