I exclusively pump and I want to quit

I’m getting so tired of pumping. My husband is annoyed cause I complain about it so much because I have to do it every 3 hours.

I set my timer and sometimes I can’t even make it until the timer before I feel I need to. My baby is 7 weeks old and I have a toddler and I’m tired of being strapped or having to think about it constantly. I even got a portable pump I use at work and it doesn’t work as good but still good enough. I feel really guilty for wanting to quit. I had goals and I know it’s good for him. He’s been spitting up my breast milk a lot lately and having tummy issues but not with formula so I don’t understand . And suggestions on how to quit without being miserable. As I mentioned, 3 hours I can go but 4 hours is INCREDIBLY PAINFUL so im intimidated