Good clinical practice demands that in all cases, a diagnosis must first be established. Taking drugs without diagnosis can be harmful. I suggest that your doctors must first determine the precise disorder from which you are suffering.
Renerve is a brand name with many ingredients such as methylcobalamin (a vitamin B-12 substance), vitamins B-1, B-6, and half a dozen other agents.
Such multi-ingredient combinations are not allowed to be marketed in any developed, advanced country with effective regulatory system. Even in India, many are being marketed without mandatory approval from the Drugs Controller General, India (DCGI). Their efficacy and safety is not proven scientifically.