violent hiccups after feeding?

Kelsey
My DD gets really hard (seems painful) hiccups usually after feeding. I have tommy tippie bottles and I don't think she's sucking in air bc I watch and make sure she feeds good. Is there a way I can try and prevent her from getting these? I feel so bad because they seem to really hurt her :( 
I am switching between pumping and formula and I was wondering if maybe that had anything to do with it? - and that's because I am not pumping enough to feed her all day and night. My milk is coming in very slowly but I'm doing the best I can! 
TIA!