My blood has been changing. It is different in color and consistency and sometimes it almost separates . Seems to clot easily too. I am nauseous and maybe run a low fever occasionally. Headaches are almost constant. I feel generally not so good as if I have flu only no vomiting or diarrhea. My blood is a big concern. How can I survive if it keeps changing and is this something all people have happen as they age? Is it a curable condition? I am also tired all the time.