I Learned This Morning That The Creatrine Was Quite Low

I learned this morning that the creatrine was quite low along with some other things like urea levels were not good either. I have been experiencing being very tired all the time, lack energy, am having trouble remembering things (scares me at the start of maybe alzeheimers), trouble sleeping, having dry and itchy skin and of course the needing to urinate more often. My muscles have been cramping quite a bit lately as well. What I need to know is the start of my kidneys failing or are these symptoms realated at all. I also have a slight headache once in a while and seem to be having "hot flashes" again but went through menopause many years ago (I am 68 years old).