According to the information that you provided, you are correct in mentioning that you have moderate chronic kidney disease
i.e, CKD 3 ( GFR= 30-89). Well at this level of GFR dialysis is not initiated, but preparation like AV fistula formation can be considered if the rate of fall of GFR is very steep. There are many causes of chronic kidney disease as I will mention but Herb Nephropathy seems likely in your case, according to the history you provided. Among the notable causes are Diabetes, Hypertension, Chronic Glomerulonephritis
, Obstruction of the bladder or urethra or both of the ureters, Autosomal dominant Polycystic Kidney
Disease, Chronic Pyelonephritis
due to reflux nephropathy, Interstitial nephritis
( One of the cause is Balkan or herb nephropathy)and some other rare inherited diseases.