I am just finished weaning my 13 mo old. I too hit the point of "I'm done" partially because I've hardly been able to be away from him for more than 2 hrs at a time since he's been born!
Our little guy also has no other means to soothe himself. It's a learning process. We've been patting his back/butt since he'll immediately flip over in his crib when we put him down to sleep. If he's fussing, we'll pat/rub or pick him up and set his head down on our shoulder for a few minutes.
He's been upset with me. He'll sign "milk" and then scream at me. He'll pull on my shirt, trying to pick it up, or poking at me. As soon as I say "no", I put him on my lap, facing away from me and let him fuss. If he faces me, he pulls at my shirt or hit and claws at me (because he's mad). After a few minutes, I'll offer him his sippy cup with cow's milk. He frequently bats it away. I let him sit and fuss for awhile again and keep offering up the cup.
After about 3-4 days we're doing good. He has been fussier than usual, up at 5:30am and hard to get back down. He wants to nurse, so it's a struggle. I continue to sit with him on my lap, letting him fuss, and keep offering the sippy cup.
I'm sure he's taking fewer calories, so it makes sense that he's waking at 5:30 to eat. It's just still hard considering we have other kids that are waking shortly afterward to get up for school.
I have been popping Claritin before bed the last 3 nights. My supply has been significantly diminished too, but I was still getting "lumpy" from milk that wasn't being drained. I did let him nurse to get rid of the lumps, but he was frustrated there wasn't enough milk.
I have had more of his favorite foods on hand - yogurt, applesauce, etc. And he now eats as soon as he wakes in the morning....breakfast right upon waking. He's been taking the cow's milk better too now.
For me, I NEED my life back. I made the choice to nurse this baby for 1 year for the health benefits for him. However I have "lost myself" in Mommyhood. I have NO life. And nursing was a big factor. Although this is my last baby, and I'm a little sad to be done. I also needed to for my own sanity. It's not that hard keeping a sippy cup in the diaper bag and giving him some water while we're out in the car.
Best wishes. Feel free to msg me if you need a friend.