I am suffering with a mod frontal headache x3 days. W/intermittent periods od poor concentration to the point last nite I was unable to hold a thought long enough to input a question online,I have a dx of CKD, a GFR of 37. The headache s not relieved with oxycodone x10mg. Are my symptoms r/t CKD? Fatigue, itching also, some lower back pain, frequent intermittent urination