Im desperate and need help

How can I get my one year old to stop nursing and using me as a pacifier . I can’t do it anymore it’s been affecting me emotionally and I’m afraid it’s getting worse . It’s too much for me now. Sometimes I want to cry and other times I get really frustrated . The frustration is building up and I feel like I’m going crazy. I don’t know what’s wrong with me. I’ve been trying to wean her and drop feeds but it’s not working . She wants to sit on it at night to fall asleep and sometimes it takes so long and I’ll start to get antsy . Then she wants to do the same in the morning. But I feel these are just for comfort because she won’t want to wake up . I’ll get up and try to give her something to eat and she won’t want it. She will want to keep nursing and I can tell she’s still tired and wants to sleep. If I keep it from her she’s been getting angry also and cries till she gets it .She’s starting to hit me if I don’t give it to her now . I really don’t know what to do anymore but I don’t think it’s healthy for either of us to keep going. I need a break and I’m worried because Im 6 months pregnant and I don’t want to feel these negative feelings with the new baby . I’m just afraid I won’t get that break with how things are going . I feel awful for feeling this way and getting irritated .