Hi There,
While ultrasound is a great tool, like all x-rays, it is just a bunch of shadows. Sometimes bowel gas can be in the way and it is not possible to clearly see the ovaries. Since there is a discrepancy between the ultrasound and the CT scan, you should ask your doctor to go over those reports and films with the radiologist. It can be very helpful for a radiologist (a physician trained to evaluate x-rays) to get more of your story and go over the films with your doctor. I find that sometimes areas of the films get reinterpreted in light of the new information. Retroperitoneal lymph nodes are lymph nodes in the deep abdominal tissues. There can be mildly enlarged in any irritation or inflammation. They do not necessarily add information. They might be a bit enlarged because of what is going on in your kidney. Hydronephrosis means that your kidney is blocked. That can cause pain, fever, kidney infections, and if untreated can cause kidney damage. You need to see a urologist immediately for that.
As far as how you are feeling, that does not sound right. It sounds like you are in the process of being evaluated which is good!
You are anemic and that can be due to many things (heavy periods, poor diet, bleeding from your intestine, drugs.) That also needs to be sorted out some more. I am glad that you are seeing a doctor! Please keep me posted.