Creatine Question

Hello I am curious if anyone has any good evidence maybe that creatine can cause issues to the liver.  I am 19 and have been on and off with different creatine supplements since I was 16.  I usually cycled them and during football seasons I would not be taking any supplements.  The only supplement I ever took were creatine and ntiric oxide. As of right now all i take is Cell Tech Hardcore which is a creatine product.  The past month, I have had strange bowel movements.  I have also been taking Sertraline (a generic Zoloft) for my anxiety issues.  I noticed these strange bowel movements ever since i started taking the Sertraline.  I am just curious if creatine can effect the liver so quickly (3 years) because i clearly have some kind of liver or galbladder issues which are undiagnosed (going to the doc on monday hopefully)