Never fasted to see God, did some fasting to find myself though (marvelous, out in the south west canyons, just me, a water bottle (with iodine for disinfecting water) and a clear stream for 72 hours. It's amazing what happens when you get away from the white noise of life. (It's not just about not eating, not eating doesn't help if you're still surrounded by the day to day crap. You need to do a little 'mental fasting' too)
The first sixteen hours you get incredibly hungry, then your body goes into 'starvation mode' and you aren't hungry anymore (I wouldn't recommend doing this in day to day, especially not if you're trying to be healthy), After about 24-36 hours you stop worrying about what's back in civilization that you need to deal worth. so from 36-72 hours you are in the here and now, nothing but the present situation. That's the good part. That's when you can really take stock of yourself.
You don't start hallucinating until you reach 72 hours without eating.
There are also many different kinds of fasting. You can consume nothing but liquids, or nothing at all, or only eat before sunrise and after sundown, it's as individual as you want to make it.
(Incidentally, I've found that I enter the same 'clear mind' stage after a few puffs of reefer.)
But for me it's not about finding God, it's about sorting my own self out.