The symptoms suggest that you're suffering from anaemia from chronic kidney disease, which is a common symptom of anemia, and black blood clots can be a result of intestinal bleeding caused by anemia, and you need to examine it more closely and start treating it as soon as possible.
Doctor, I've been experiencing a number of symptoms recently, that the kidneys don't work properly, and I feel like I'm losing my breath, and I have a black clot, and I'm getting a lot of cold.