There are some medications that may cause dizziness and/or frequent urination ending up with dehydration. I was in Stage 4 with Farxiga and Torsemide (a diuretic) on separate occasions, each time causing me restlessness and fatigue. I stopped those medications on separate times and my labs last week showed my eGFR in Stage 3A . I try to drink 70 ounces of water daily.