How to stop nursing my 18month old?!

My daughter will be 19 months on the 30th. She still nurses. She was only nursing twice a day for nap time & bedtime. She recently got a cold & of course nursed more than usual. Well, now since I let her do so, she thinks she can have it when she wants. I’m currently working two jobs & when we are home she begs for it & with me being so tired/exhausted I just give it to her because I don’t wanna hear her throw a fit. But next week I go down to working one job, so I need advice on how to get her to stop. I’m tired of her being latched to me all the time it seems. It sounds mean, but I’m just over the nursing stage & want it to end 😅 my nipples are sore & I just wanna get a good nights rest without her being attached to my boob.

So any advice?