Ok. I'll hold.
There was another, older Help Post, where the OP fixed his DNSMASQ by upgrading to Raspbian Stretch.
Here is the other Post:
I was going to do that upgrade, but I thought I'd wait to see what happens on this thread.
Currently dnsmasq is at version 2.76 on my Pi-Hole server:
dnsmasq -v
Dnsmasq version 2.76 Copyright (c) 2000-2016 Simon Kelley