What precautions I should take to avoid any further damage. The reduction in size might be due to the after effects of Ultra sound, which was done for breaking the stones. 180 mg per day. Hypertension in your case may be due to the narrowing of the renal artery. The cure for this condition as far as I know is surgical correction.
Medicines can only control blood pressure.
Your doctor will be the best person to guide you. I am strictly vegetarian since birth and have not eaten any egg or meat till date. Consume these products only for one meal. Have plenty of fruits and vegetables daily. He had a chronic renal failure and had a renal transplant surgery done couple of years ago.