Resenting breastfeeding

I was so excited when my son was born and even though it was a csection I was able to hold and nurse him right away.  Now I'm 3 months in and I hate breast feeding.  I feel like o have no time alone bc he nurses every 1-3 hours and I'm constantly holding and nursing him.  I also can hardly care for my 3 year old bc I'm always nursing the baby it seems.  She acts out and is jealous.    
 I go back to work in a few weeks and I really don't want to breastfeed anymore.  I know this sounds awful but I just need my sanity back.  He will take a bottle so that shouldn't be an issue.    
I know that breast is best but it's affecting my sanity.  I already have anxiety and have for 5 years (taking lexapro) and now I feel the worst I have in years. 
Can I dry up my milk somehow?  Should I call my midwife?  I just feel so lost and isolated.