How Can Elevated EGFR Levels Be Treated?

My kidney EGFR level has been between 60 and 70 for the last cuple of years. I am a Hispanic woman 77 years old. The last blood test that still had those levels was in june 2017. I just had another blood test, 2 weeks ago and my EGFR has dropped to 37! My creatinine reads : 1.37. I take Lisinopril (40mg) and hydrochlorothiazide (12.5mgcp). Back in August 2017 I started drinking 1 cup of water with 2 tbspns of apple cider vinegar in the morning on and empty stomache and in the evening, 1 hour before bed and at first took the water pill every other day then eliminated it completely after a month, and my blood pressure has been normal. I stopped taking the vinegar in December, because I was so busy during the holidays and instead started taking the water pill in its place. Ive gotten very dehydrated since I started the water pill and now these terrible kidney readings! Should I go back to vinegar? My Doctor wants to send me to the kidney doctor! Help! Please!