How do I wean from the boob?

My ds is 12 months old and even though we both love b/f I feel I have to wean because of the possibility of food allergies and he keeps getting thrush.
But, how do I wean him when b/f is his main source of comfort? He nurses constantly throughout the night and b/f is the only way he will fall asleep. Plus we co-sleep. We want to do sleep training with him and attempted it once, but I can’t do it when I know he’s in pain from reflux. I wanted to wait till we get what’s ailing him figured out and he’s feeling better, but I don’t know how long that’s going to be. Am I crazy for even thinking of weaning?
Any tips or advice on weaning a refluxy baby would be greatly appreciated
TIA!