Can using Kolonopins over 12 years lead to dementia?

 I am 58 years old and have a lot of stress on my plate. I have always been a nervous person. I have taken care of my father and mother, she is still alive, 82 years. My father passed away at 73 years. Most of the symptoms I have read during and reading these all these signs, I feel that I may have done this to my self or a member in the family has had it, I am not sure. The signs are there. My mother-in-law is now leaving with my husband (her son). I see the signs getting a little worse. I know medications cause a lot of different side effects. I do things over and over, or make a mess just to give me something to do. I have forgotten how to spell a simple word. Takes a few minutes to sound it out. I do sleep a lot due depression and/or grieve. Can I please get some true answers on this type of medication mentioned above