Pain in both kidneys spread to sides of abdomen and legs, urinating less, insomnia and anaemia since june/july. causes?

Complicated picture!: Symptoms for 5 months in several different categories, may or may not be due to just one cause. You have been sick long enough without improvement. Time to get a thorough examination from your doc and any appropriate testing based on the exam and your symptoms. Then a treatment plan can be made. Get seen by your GP in the next week. If you feel worse, get seen sooner.