Here's a link showing potential side effects, but all of those would have occurred during treatment, or very soon thereafter: https://www.mayoclinic.org/drugs-supplements/rabies-vaccine-intramuscular-route/side-effects/drg-20069868
There is no evidence showing that a vaccine received 60+ years ago could suddenly cause problems. The half-life of any components in the vaccine would not be more than 2 weeks, so issues would show up very soon after vaccination - not 60 years later. Personally, I'd drop the notion that the vaccine caused issues so that you can focus on getting to the root of the real problem.