How to wean a boob addict?

At first I was planning to wean around 14 months like I did my first, then 18 months... now at 26 months I am still feeding every night. We were done with daytime feeds when she turned 1, but I can't get rid of the night ones.

She is completely obsessed with my boobs. I think boobie was one of her first words and she actively asks for it. If not to eat, then she needs to touch it. Every time she is upset, bored, tired or just missed me her hand goes under my clothes.

Every time I am thinking of weaning she's sick or teething or something else. I tried a couple of times but she'd cry for hours and I would give up. I guess I also feel guilty for working full time since she's been 3 ms, so I can't bear to deny her.

But I am so exhausted! To the point that I get dizzy. She wakes up multiple times at night, she takes forever to fall asleep. We are also cosleeping. I feel overstimulated and over touched. Idk how to do it or if I should move her to her own bed first. Help!