I'd also ask a medical professional about the vaccination and if anything has changed in the prior 35 years if my math is correct based on your numbers. It's possible there's something different being administered than when you last had it?
I visited India last year and was reluctant to take the antimalarials but was advised by a friend (who is a physician) to go with one that was generally well-tolerated versus the prior types commonly administered. It turned out to be fine.