Talk to Nephrologist on Kidney Issue

My father is 60 years of age. A year earlier after some tests we found our he has minor kidney issues with creatinine levels at 3. We went to doctor and Alhumdullilah were satisfied with his medication overall. The levels stayed around the same place with minor fluctuations for one year. Recently somebody suggested us to visit another doctor and we did. He completely changed the medicines and my father took those for two months, recently he starting feeling more nauseous and then his ears bled two days earlier. He vomits once everyday since the last three days. His creatinine levels as of now are also 6.1, what should i do now? Consult the old doctor?