I'm 19 years old and recently I was diagnosed with a Hydrocele after having a slight pain in my left testicle after my doctor preformed a ultrasound. My doctor recommend I take Naproxen Sodium (550mg) Twice Daily. I've been taking my medication for about 3-4 days now and today I noticed my stool to be a very dark black color. I checked online and now I'm worried because "internal bleeding" is amongst them. Should I see my doctor or should I stop taking the medication.